Another twist, another pull... and that's another garbage bag tied, hopefully it's the last one.

"Geez, sensei. If you had to teach a subject that involved cleaning, you would definitely get fired for sure."

"H-How could I know? Can you at least have some sympathy for me?"

Taking place in an apartment, young man Yuiga Nariyuki is having a conversation with Mafuyu Kirisu, a long-time teacher at Ichinose Academy. However, Nariyuki has graduated from the academy, and now he is one of the top students in Education college, or in other words, this is his last year. Right now, in order to graduate and become a teacher, he has to participate in a two-month trainee program at Ichinose Academy.

But being a trainee or still a student at the academy, cleaning his teacher's apartment is still an ordinary habit for him.

"Kirisu-sensei, you seriously have to learn how to take care of yourself. To me you are having an unhealthy life. What if one day I graduated from the college and lived far away?"

"Provident. Do not worry about me. I was still fine before this whole thing happened anyway."

Even before or after our main character left the academy, Mafuyu still manages to live in a mess and gets used to her accommodation very well. Still the same habit as being a slob, eating instant or delivered food, and even sleeping on cold floor, with her bed is now a second desk. But she knows deep inside that without Nariyuki's help, no one would ever recognize if this was a woman's apartment or a shared room of a group of drunk guys.

"Hurry and throw away these garbage bags, Yuiga-kun, or you will not have time to study. You will be very busy from now on, so every second is precious." Mafuyu told Nariyuki.

"Okay, okay, I know. I will be going now, Kirisu-sensei." Nariyuki smiles back and grabs the bags.

Oh, and there is something I didn't tell. During the trainee program, Nariyuki is under supervision of Mafuyu, as a trainee teacher. He is teaching history, with Mafuyu's responsibility to tell him what he needs to improve or avoid. Tomorrow will be the last day of his trainee program, and with one more test to go, he will graduate as a teacher.

"You know, I can't wait for tomorrow. My last day of the trainee program, my last day to meet all of the students, and after that, those two torturing months will be over." Nariyuki said and stressed his arms, letting out all of the stress. Those words from him somehow makes Mafuyu surprises.

"What do you mean 'torturing'? I think you are too well-known with this, especially when you were tutoring Furuhashi-san, Ogata-san and Takemoto-san." Mafuyu asked.

"You know, teaching under the death stares from Kirisu-sensei, dealing with students who didn't pay enough attention... What we are talking about is over 30 students. I don't know teaching can be this hard."

"Can you repeat that first part of your answer? It's like my ears have buzzing bees in it." Mafuyu glares at Nariyuki.

"I refuse."

Although still being angry for being recognized as a scary person, Mafuyu lets it pass and thinks about the last two months. Seeing his teaching method, she can understand why Fumino, Uruka and Rizu learned so well and graduated from the academy. However, there is still some unprofessional, something should be avoid if he's aiming to become a good teacher after graduation.

"Yuiga-kun, don't you think that there is some problem with your teaching method?" Mafuyu asked.

"I don't see any specific one here. I think I'm fine with that, the students are fine with that." Nariyuki said with a confused expression. Mafuyu then let out a sigh and continue. "Misunderstanding. It's not about pleasing the students and proud of yourself here, Yuiga-kun. You should know what is good for them, even when you have to sacrifice or being the one they hate. It's all about their future." She explained.

"I think I'm still doing a good job for their future, Kirisu-sensei."

"You mean showing some Donald Duck cartoon to talk about Nazi and Hitler?"

"W-Well, it's still relevant in some angles..." Nariyuki said, and the pink haired just sighed at this young man's mind.

"Nevermind. I don't know what you are thinking at anyway." Mafuyu told herself. But she has to agree that this is the Yuiga Nariyuki she knows, the one who would do anything for anyone else, even with such a strange mind and a pervy head that not even any formula can explain why. To her, she wants Nariyuki to create his own path, do whatever he feels right, as long as he knows what the purpose is.

"Sensei... Kirisu-sensei! The stairs!" Nariyuki shouted and brought her back to real life. But because of being in her land of thoughts, she slips on the staircase. Luckily, the young man in glasses grabs her hand just in time, before it gets any worse. Mafuyu still has some pain on her knees for pumping in some of the stairs.

"Hey look. This is just like in Tangled. I'm Rapunzel who's grabbing your hand to pull you up, while you are-"

"Just... shut up, Yuiga-kun." Mafuyu said, with a red blush on her face, while being in an awkward position with her former student.

O0O

Mafuyu and Nariyuki are now heading to the garbage dump, with bags of instant ramen cups, bones and trash in their hands and even on their shoulders.

"Kirisu-sensei, I can't wait to start my job! The rest of my friends are looking forward to the graduation test, too!" Nariyuki said excitedly.

"Composed. Don't be too excited like that. You think being a teacher is like eating a cake or something?" Mafuyu warned him. She knows that he's looking forward to graduating from Education college and becoming a teacher, but everything is not easy like he thinks. Just like when she first took the job, she thought that giving the students motivation and encouraging them was enough.

Until she made a terrible mistake that almost ruined one of her students' future.

Thanks to Nariyuki, and perhaps thanks to the time that she was recognized as a teacher after retiring figure skating, she knew her former student, the one she had considered as her first failure at teaching, was doing fine. Even so, she knows that the future ahead for Nariyuki is going to be tough and filled with challenges.

"Considering. Starting after your graduation test, you are going to have a rough time, Yuiga-kun. Why are you so innocent like that?" Mafuyu said to herself, but almost enough for Nariyuki to hear it. "What did you say about me, sensei?" Nariyuki asked back, and received a head shake from his teacher, told him to let it slide.

"So how is your... friends, Yuiga-kun?" The former figure skater asked, with a little hesitate in her voice. Perhaps she is not used to saying 'friends'.

"They are doing good, actually." The black haired said, then continued. "Fumi- I mean Furuhashi-san is having one more graduation test to go, and she is about to follow her mother's footsteps, with some help from her father. Ogata-san is sure to become a psychologist, but I don't know if she will use her knowledge for the others or just to win games. And Uru- sorry, Takemoto-san is in a swimming competition worldwide."

Those three were also the mistakes that Mafuyu made. Can't believe that they are actually on the road to success, those she considered as 'failed talents' told them to change their future paths. But once again, with his teaching method, it's that boy again, Yuiga Nariyuki, proved her wrong. It's like every mistake of her life was fixed by him, just him.

Talking about Nariyuki, although she's talking like that, but that's not the thing she's worried about. Walking on the side road, she keeps thinking about his future path. What school will he teach at? Will he live at his old home or move to the other apartment? And how will her life... her apartment be without him? These thoughts are still running in her head in a circle, a never-ending loop. Is it because of her considering for students as usual, or something else?

"Question. Have you considered which school you will be teaching after graduation, Yuiga-kun?" Mafuyu asked.

"Oh ho, and what is your reason for asking me that, Kirisu-sensei?" Nariyuki asked back and made her blush again. "N-Nevermind that!" Mafuyu said and looked away, didn't want to look at the trainee she is supervising.

"But yes, I've made my decision, and I think this is the best for me. I'm thinking about..." Nariyuki said, but he also looked at his right side, where Mafuyu is walking next to him. Because she's been thinking a lot, she doesn't realize she is walking in the middle of the road.

And she doesn't realize that there is a honking truck coming toward her, with high speed, and it's about to pump into her. The driver must have been sleepy, so it seems that the truck is being braked, but with its speed, it won't be able to stop in time. A large sound of horn can be heard, and makes Mafuyu to look up, to find out that she is in danger.

"SENSEI! WATCH OUT!" Nariyuki screamed, but Mafuyu didn't do anything. She is surprised with it and her legs are totally frozen. Without any hesitate, the black haired student runs to her, pushes her away, just when the truck is just meters away from her.

And so, the truck doesn't pump into Mafuyu.

It is Yuiga Nariyuki.

Soon recovering after pushed and pumped into a neighbor's wall, Mafuyu opens her eyes, and widely opens in terror. The truck has stopped, but there is her student, unconscious in the middle of the road, blood from his head blends in the black color of torn garbage bags that once in his hand. The truck driver then drives the truck away, doesn't want to get in any bad situation, leaving Mafuyu paralyzed on the right side of the road, and the bleeding student.

"Y-Yuiga... kun... You're still okay right? P-Please, answer me..." The teacher is so shocked, she can't even say any proper word. "H-Hey, Yuiga-kun... t-this is a joke, isn't it? This is fake blood, right?" She shakenly crawls to her student, but feels something weird on her hand. It is covered in her student's blood.

"i-i should be calling for help, right...? I should call an ambulance, r-right?" Mafuyu tried hard to say it, but obviously there is no response. She is shakenly reaching her tracksuit's pocket, only to realize she doesn't bring her phone with her. She looks down the ground, with teardrops of terror fall down.

"someone... help... PLEASE! SOMEONE! PLEASE!" She screamed for anyone's help, didn't able to control herself from the shock. Holding her student's body, she cries for help, with finally she gets the neighbors nearby's attention.

Hopefully, she can save Yuiga Nariyuki as soon as possible.

O0O

In front of the surgery room's door, she is curling and leaning her back to a wall, covering her head with her arms and knees, remembering the accident.

"It was my fault... it was all my fault..." She mumbled with some sniffing, tears didn't stop falling from her eyes. If she was more careful, this accident wouldn't happen.

"Mafuyu-chan! Are you okay?" She hears someone running toward. It's Nariyuki's mom, Hanae, and his little sister, Mizuki.

"Yuiga's mom... I'm sorry... I'm very sorry... if i-it wasn't because of me..." Mafuyu shakenly said, before covering her head again, sobbing silently.

"Now, now, Mafuyu-chan. Calm down. Everything will be alright. Yuiga is under surgery right now, right?" Hanae said while patting her husband's former student's back. Mafuyu was Nariyuki's dad's student back then, so with this situation, not only she failed as a teacher, but as a responsibility to her teacher's son. Even getting Nariyuki's mom forgiveness, she still thinks she doesn't deserve it, nor having any right to look at her face.

The surgery room's light turns off, as the surgeon walks out the door, ready to delivers some news. "Doctor, is my son okay?" Nariyuki's mom asked him, but received a head shake. "His terrible state is now over, but I'm afraid he will be comatose after this."

With all of her calm, Hanae tries to ask the surgeon one more thing. "How long will this be, doctor?"

"... I don't know. His skull and brain is having a huge injury. We need more time to keep him from any further damage..." The doctor said, and made Nariyuki's mom speechless. The future of the soon-to-be teacher, the future of her son... is almost over. This also makes Mafuyu shocked as well. Just hours ago, she was talking to him about his future. And now, not anyone, but her, is ending it.

"Y-Yuiga's mom, I-" She tries to lift her face up, but receives a kick to her left arm, from Nariyuki's sister, Mizuki.

"MIZUKI! DON'T BE RUDE!" Hanae scolded her daughter, but she shook her head, looked straight in her mom's eyes, with watering eyes of herself.

"WHAT DO YOU MEAN I'M RUDE?! THAT GIRL KILLED MY BROTHER!"

"BUT YOU SHOULDN'T BE LIKE THAT! SHE'S MUCH OLDER THAN YOU! HAVE SOME RESPECT!"

"BUT MOM-"

"ENOUGH!" Mafuyu shouted and surprised the Yuiga family. "I'll be... taking my leave now..." And so, she gets up, and takes her leave, with Mizuki's rude words behind her.

"THAT'S RIGHT! LEAVE! AND DON'T GET CLOSE TO US EVER AGAIN!"

O0O

Opening her apartment's door, with darkness covered all over her place, she still feels pain and regret. If she knew where she was going, this wouldn't happen. And now, her student, the one she's been having attention on the most, the further future of him, is now ruined.

With all her pain and rage, she starts smashing any stuff in her apartment, slamming her fist, not even care if she will injure herself. She accidently throws her working desk at a cabinet, containing her awards and her photo back when she was a figure skater.

Looking at the cabinet with broken glass, looking at the photo before she retired, she can't control herself. "IT'S ALL BECAUSE OF YOU! IT'S BECAUSE OF YOU! ONCE AGAIN! YOU MADE MISTAKE AGAIN!" She keeps repeating herself, putting all her rage on the cabinet. And with a final slam, when she's exhausted, she's just lying on it, tears rolling down her cheeks like waterfall.

Outside, there isn't any sound. Just a peaceful afternoon to everyone, but a pain for the pink haired teacher. The apartment is once again messy like it used to, but this time, there won't be anyone come and help her clean. Only the sound of a regretful teacher, weeping in pain, a sobbing mess.

Her student's tomorrow, graduation test... All of them are now turning into dusts...

"Yuiga-kun... I'm sorry..."

Chapter 1

A sudden [X] brings an unforgivable pain to the predecessor