you are having a sleepover at Kamisato house because Ayaka invite you to have a sleepover so you agreed with her

after next morning you didn't see Ayaka around maybe she already woke up first?You walk out from Ayaka bedroom but you decide too look around

you were infront of door... Someone door you curious who might be in there when you about to open it... A tall handsome guy open the door first

"Oh? Uhh... Who are you?"

this must be Ayaka brother that she talk about