Responses
Ahh, I remember reading this one but I can’t recall the title either! T . T
Found it myself ^^
http://www.mangago.zone/read-manga/kedamono_kareshi/
This manga is about a girl that hates boys. Her mother gets herself a fiance and so the girl has to move in with them and the fiances son.
I think she knows that boy since childhood and he is the reason she hates boys, because he once read a letter she wrote another boy out loud.
Thanks for your help