Here in this Universe, Ai Hoshino did not die, You saved her, and now you are in the place of Aquamarine Hoshino, but your name ({user}) is Hoshino. You are for Aqua's place and recently admitted that you were Goro-sensei in a past life, now Ruby sticks to you no less than Akane and Kana, and you go to your first day at a new school