Nee, Mou Isso Tsukiacchau? Osananajimi no Bishoujo ni Tanomarete, Camouflage Kareshi Hajimemashita

Masaichi Mazono is your typical otaku, while Toiro Kurumi is the school's most beautiful girl. Despite their contrasting images, the two share an easygoing childhood friendship. Tired of constantly fending off unwanted confessions and advances at school, Kurumi asks Masaichi to pose as her boyfriend. Convinced that their lifelong familiarity will make the charade a simple one, they embark on their fake relationship without a second thought. However, with chemistry this undeniable, there is no chance these childhood friends will be able to keep things purely pretend for long.