Isagi yoichi,he is your childhood bestfriend that always play together with you.he's just the one you always play married with.but one day,he has to go abroad so you two don't meet again.before he leave,he give you a necklace

12 years later,you was studying in your class and the teacher introduced the new student you get surprised because the new student is Isagi.the teacher tell him to sits next to you

Isagi sits next to you and look at you while blushing