(L/N)(Y/N), a middle school third year in Kimetsu Academy. She's a popular girl with a lot of admirers. She's a pure and innocent girl, smart, charming and polite. She's known for her angelic smile and beautiful heart.

Yet here she is, stalking her crush. She knows what she's doing is probably wrong, but she couldn't help it. After that day, she knew she had to repay him somehow. But she didn't even know how to.

All she knows is that the love of her life went by the name of Shinazugawa Sanemi, a second year in highschool and a classmate of her best friend, Kanae. She also knows that he used to know the previous delinquent leader and that he too is a delinquent. The only reason he wasn't kicked out was because of his exceptional grades.

'Sanemi... his name sounds nice...' She thought, hiding behind a pole, looking at Sanemi walking calmly. 'And he's so calm unlike at school...' She was awestruck, watching the guy.

Sanemi, on the other hand, felt scared. For the first time in his life he felt a cold sweat run down. 'Someone's following me.' He knew he was being followed but he was scared to look back. Whoever it was hid their presence pretty good. 'Another one of those fans of that... girl from that day?'

Sanemi took a turn and (Y/N) followed. Sanemi then stopped in front of a store and entered, (Y/N) followed him inside, making sure that he didn't spot him. Her eyes were trailing him as she browsed through the snacks aisle and took a pocky with her. Sanemi was looking through the various flour and other things. He took mochi rice.

'Oh! Does he like mochi!? I can make him some!' (Y/N) thought, walking over to the counter and quickly paying for her snack and running outside to make sure Sanemi did not spot her.

"Please come again!" The store clerk waved goodbye as Sanemi left with his bag of Mochi flour and made his way back home, (Y/N) just behind him, still following him.

It wasn't long after when Sanemi finally arrived at his home and he entered, leaving (Y/N) alone outside. 'Yes! I finally know where he lives!' She cheered, feeling all kinds of emotions bubbling inside her. 'I'll pay him a visit next time! Then, introduce myself to his family! Befriend them! Then tell them what kind of a hero Sanemi is and at that time, I can get close to him and then-'

"Excuse me."

"KYA!" (Y/N) exclaimed, turning around and clutching her pounding chest. Behind her was a boy with a mohawk, a scar across his face. The boy was around 12 or 11. But there was something that (Y/N) recognized with the boy. The same eyes as her crush.

"Are you a friend of aniki? You have the same uniform from his school." He asked, tilting his head to the side.

"Ah..." (Y/N) looked to the side, thinking of a way to answer his question. 'Wait! If I tell him yes, then I can befriend him too!' With that decision in mind, (Y/N) nodded. "Yes, I'm a friend of your aniki! Nice to meet you, (L/N)(Y/N)." She extended her hand.

The boy smiled, taking her hand and shaking it. "I'm Shinazugawa Genya! Nemi's little brother!" He introduced himself. "Why don't you come inside!"

(Y/N) flinched. How can she go inside, if she did then Sanemi would know that she followed him. "U-um... I-I don't think-"

"It's okay!" Genya said, taking her hand and leading her to the house. "Mama is very nice! She likes to have guests over! And she kept telling Nemi to bring his friends over for her to meet!" (Y/N) couldn't do anything as she was dragged inside. "I'm back!"

"Welcome back, Genya." A woman came and greeted the boy. She was quite petite. She had black hair and the same purple eyes as her two sons. "Oh, is she your friend, Genya?" She asked.

"Nah, she's Nemi's friend!" The mention of Sanemi's friend, the woman immediately lightened up as she approached the girl and gave her a hug.

"Oh my dear! It's nice to meet you, I'm Shizu, please feel free to call me that!" She broke the hug as she led the girl to the living room, Genya went upstairs. "This is the first time Sanemi had ever brought a female friend over! It's always been guys he's brought over, at one time it made me think that he swings the other way."

(Y/N) snorted, covering her mouth to keep her from laughing. "I-I see... I'm (L/N)(Y/N), nice to meet you, Shizu-san!" She gave the woman a smile.

"Oh what a polite girl you are!" She cheered, getting up from the couch. "I'll be making you snacks, I'll call Sanemi and the others later so just you wait!" Before (Y/N) could tell her no, she was already gone.

Here she is, sitting on the couch, nervously waiting to be told off by Sanemi for stalking him. She was basically shaking in her seat. 'I need to calm down...' She stood up and looked around the living room. She noticed a lot of pictures and decided to look at them.

One of them was a picture of a young Sanemi and a baby Genya. The two of them were smiling in a field, Sanemi holding his baby brother. (Y/N) only had one thing to do, that was to take a picture. She knew that this might not be the best decision but it was just too darn adorable to pass up the opportunity.

[*heavy breathing*]

'So cute! Sanemi and Genya are such adorable babies!' (Y/N) squealed on the inside as she stared at the picture on her phone. 'And saved.' She clicked a button and now the photo became her wallpaper.

"-what friend?!" (Y/N) jumped as she made a dash to the couch, immediately hiding her phone when she recognized the voice. "I don't got any girl...?" Sanemi was standing by the door. (Y/N)'s eyes widen at the sight, her face red. Sanemi was standing there without a shirt on.

"I didn't mean to look!" She exclaimed, turning away and hiding her face.

"AHH!!! What the heck are you doing here!?" Sanemi pointed a finger at her, still not going away to put a shirt on. "Did you seriously-"

"Sanemi!" Shizu cut him off, hitting him on his arm. "We have a guest over, you should go and dress properly!" Sanemi didn't say anything and ran back up-stairs. "I'm sorry, (Y/N)-chan. He's usually like this back home."

"O-oh no no no, it's o-okay..." (Y/N) stuttered, still feeling flustered. "I-I was the one who came unannounced..." The image of Sanemi flashed on her mind once again, making her explode into a thousand shades of red. 'OH MY GOD! I just saw Sanemi without a shirt on!' She was sure that with the heat her face was having, she was going to have a nosebleed sooner or later.

"Anyway, here, I got you some tea and Ohagi." Shizu sat down at the other sofa, placing the food on the coffee table. Then, her eyes went to the door where children were hiding, (Y/N) followed her gaze to see four other children. "Everyone, come here, meet your nii-chan's friend."

The children entered the living room, hiding behind their mother and peeking a few looks at (Y/N). (Y/N) thought they looked adorable. "Hello." She gave them a little wave as they smiled and waved back. (Y/N) took her bag and took out the snack she brought earlier and handed it to the oldest girl. "Nice to meet you, I'm (Y/N)! What's your name?"

"I-I'm Teiko..." The oldest girl stuttered, examining the pocky. "U-um, thank you for the food." She bowed.

"Ah~ Cute~" (Y/N) cooed. She always wanted a little sister or maybe a female cousin, but her family said they were done with the birthing. She cried a lot that day.

"Miss (Y/N), are you aniki's girlfriend?" The one that looked like Genya asked. The question turned (Y/N) into a tomato as she began to stutter.

"G-g-girlfriend?!" She exclaimed, holding into her red face. "M-m-me?! Shinagawa!?" She was malfunctioning.

"So you're not?" The youngest girl asked, on her hands was a little boy. "We thought you were nii-chan's friend..." They pouted, looking at the ground and tucking some of (Y/N)'s heart strings. "We just thought that maybe he finally had friends..."

"WHO SAID I DON'T HAVE FRIENDS!?" Sanemi came running inside the room, Genya behind him as he took his younger siblings and made them sit down besides their mother. "What are you doing here?" He asked (Y/N) harshly, looking to the side.

"O-oh," (Y/N) said in disappointment, she knew this was going to happen. "I-I just came here to thank you."

"Why?" The children and their mother asked.

(Y/N) smiled, remembering that day clearly. "Shinazugawa-"

"Dear, please do call him Sanemi." Shizu interrupted her as (Y/N) nodded. She knew calling someone their last name in their own household was going to be confusing.

"W-well, S-S-Sanemi!" She accidentally shouted his name and she turned beet red and squicked out an apology as she continued. "Sanemi saved me from someone. And I wanted to give him my thanks. And today, I just so happen to pass by and Genya saw me and invited me in."

Shizu and the kids were in awe as they stared at the still grumpy looking Sanemi who was looking to the side, not bothering to spare (Y/N) a glance, although Shizu noticed the little blush he had.

'Happen to pass by?' Genya cocked his head to the side in confusion. 'I saw her following Nemi though... Maybe she followed her when she saw Nemi...'

"Shizu-san, you raised a very brave son." (Y/N) bowed down and Shizu was on the verge of tears. All her life she only saw Sanemi as this harsh but caring son towards their family. But to think that he would save someone.

"Great!" Sanemi exclaimed in a sarcastic tone. "Now that that's done," He pointed to the door. "Get out."

"Sanemi!" His mother scolded. "Dear, you can stay here for as long as you like! I'll go make us some dinner! You're invited!"

"R-really?!" (Y/N) beamed as Shizu nodded and left, taking the kids with her, leaving (Y/N) and Sanemi alone in the living room. "Um... Sanemi..." Sanemi turned to face her with a straight face. "Uh... I... I'm... I..." She tried to speak, but no words came out.

"Just say what you're going to say, I ain't going to bite you." Sanemi shrugged, relaxing on the sofa as he glanced over (Y/N) who was fidgeting in her seat. [not according to that one chapter you wrote]

"Well... thank you." She finally said.

"You already gave me your thanks." The moment those left Sanemi's mouth, he immediately felt regretful when he saw (Y/N) looking all teary and sad. "Can you not cry!" He exclaimed, but it only made the situation worse. He did not know how to comfort people. "Dammit! Stop crying!"

Boy he was panicking bad. And right by the door were his siblings, watching in disappointment.

"I-I'm sorry..." (Y/N) sobbed. She was not used to being shouted at. In her home she was treated like a fragile girl who could die just by slipping. It was because of the pond incident did they think that she's too fragile. "I didn't m-mean too..."

"Look." SAnemi sighed, having zero confidence in his comforting skills. "Just stop crying. Do you have a reason to cry?" He asked. She nodded and he felt even worse. "W-what is it?" He asked nervously, crouching in front of her.

"Y-you..." She trailed off, feeling all kinds of things when he suddenly crouched in front of her. "I'm sorry... you just look so adorable right now."

"THAT'S IT!?" He shouted, making (Y/N) flinch and cry again. "OH MY GOD! Stop crying!"

"Sanemi! Why is (Y/N)-chan crying!?" Shizu exclaimed from the kitchen, sensing the disturbance with her mother's senses.

"I didn't do anything!"

And so, this was written in the Shinazugawa Family history as the first time they've met a female friend of Sanemi.