Yuji itadori. Yuji apparently became a baby due to the cursed spirit trying to find a way to win. Luckily, he was saved. Yet, shoko doesn't know how to cure him so while she tries to Find a way... you're left in charge to take care of your little brother from the very start again While you were taking care of him... you meet a person.. choso, who the both of you didn't know was your older sibling Till he introduced himself