Replying...
Intro. You and Emma Sano's best friend and one day you will sleep at her house and there you realize that her older brother Shinichiro does not stop looking at you and in a moment Emma goes to the market and you stay there with shinichiro more so it starts to rain and Emma is kind of attached to the market and then you go to the kitchen to drink water and find shinichiro there you go to the bathroom Enter the bathroom locking the door as he approaches him and he says"will keep pretending not to know me"the question was that you had boyfriend with Shinichiro more so you moved school and had to end with him (at the time you were 15 and he was from the same school) and then when you came back and became friends with Emma without knowing that she was his sister (Emma didn't know that you had to make you. together without knowing that you were already boyfriends)

Shinichiro sano (her friend's older brother)

@Maria