*No one's POV*

Today's the day the all out battle between the humans and titans,[Y/N] was then approach by Mikasa as the entire guild and scouts prepare to battle the titans Makarov then transform into a giant and engage the beast titan.

*Mikasa's POV*

I approach[Y/N] as we stared at each other I can see his eye's have no emotions in them "[Y/N] why did you betray us? what do you gain in helping them?" I ask him "that's none of your business Mikasa" he said in a cold voice "Now draw your blade" he demanded he requip himself with a dark blade with a flame engrave in it I hesitated and still draw the sword Erza gave to me then we engage in a sword battle as blade after blade clash his emotions are delivered to me I was confused to get his emotions it was telling me that he didn't mean it he was faster than the last time I couldn't get this feeling that he's still on our side I was tired from blocking him just as I was about to engage him but everything went black afterwards all I could hear are the screaming of my comrades i woke up still weak all of our comrades have collapse Master Makarov is seriously injured as[Y/N] stood in front of him "Finish him[Y/N] and we will secure our victory" the beast titan commanded him "any last words human?" the beast titan ask the master "yeah,[Y/N] you are relieved of duty" Makarov said I saw[Y/N] smile the he mumbled 'finally' then he shoots a light spear against the titan.

we were all shock by the sudden development he then kick the beast titan back "what's the meaning of this?" he ask[Y/N] in shock [Y/N] then move his hands to the side and a wall of flames covered us he then face all of us "Light dragons heavenly light" then we were slightly engulf by the light I can feel my wounds healing and I was regaining my strength "Can I explain to you guys later now let's finish this battle first"[Y/N] proclaimed we engage again this time he's on our side 'no matter what the reasons are I'm relieved that he's still on our side' I thought the battle rage on for hours all that's left are several Titan's with the three major ones "Master can I go all-out this time?"[Y/N] ask the master he nodded he then smiled "now let's put an end to their reign once and for all!!" he exclaimed "Devil slayer Secret art....... Hell's Destruction!!" he punch both his fist against the ground we felt a large tremor and all of a sudden all of the titans are engulf in a great pillar of Dark red flames. it was humanity that triumph against them as we rejoice in victory. we have captured the beast titan and Reiner and Bertolt [Y/N] put the seal of the Holy dragon on them to nullify their abilities.

*Back at HQ*

"Now[Y/N] can you explain to us the reason why you joined their side?" Erza ask with a serious face then he started the story the night of the betrayal

*flashback before the betrayal*

*No one's POV*

"I actually have a plan" Levi said "what is it?"[Y/N] ask the corporal "you will become an undercover agent for us" he said "that's right you will be the spy, you'll have to attack us if anyone tries to engage you knock them out as fast as you can, then run then the beast titan shall know of your betrayal against us" Master Makarov said "can I at least tell team Natsu or squad Levi?" [Y/N] ask the three "you cannot, the success of the mission we've given you is about three-fourths if anyone other than us four knows about it the plans on succeeding this mission shall diminish" Commander Erwin said "I've have to hurt my own comrades for it" [Y/N] said in a worried tone with tears rolling down his eyes Makarov then put his hands on his shoulder to calm him down "don't worry about it as long as you're heart is with us we will always understand you, I've known you for a long time you have a heart that is pure and cannot be tainted by anyone, you can do it my boy" [Y/N] hesitated for a while but he agreed to the plan.

*flashback end*

*Erza's POV*

"That's is the reason why I betrayed you guys" [Y/N] ends his story "what happened to Kronos?" I ask him he just smile "so you killed him!?" Gray ask furiously he shook his head in response "so where is he?" Mikasa ask "he's right in front of you" he answered as he turned his appearance into Kronos we we're all shock "me and Kronos are one of the same person, the clone that met you the other day is an Ice-make clone" [Y/N] said we were all relieved that he didn't betray us "I'm sorry everyone, I've put you all in a very awkward position when I betray you, I hope you can forgive me"[Y/N] said bowing down before us in a sad expression, I approach and hug him very tightly "I'll never be mad at you not now not ever" I stated to him as he broke down and cry in the hug like a child who has done a terrible thing to his family but it's been forgiven by them then all of us hug him "welcome home" me, Mirajane, Mikasa and our comrades said to him then he smiles brightly "I'm home" he said still crying. After that we party all night drinking, fighting and getting merry after that we went to our quarters.