Mafuyu Shiina

Minatsu's sister who is a swaying bishoujo, and is afraid of males. Ken thought her to be "the easiest character to see the ending" but later turns out to be the most feared one by some reason. She's an avid gamer and was seen playing her handheld console (most likely a "PSP®") in most times. She likes to play all kinds of RPGs, and devotes a lot of her time to writing BL fanfics starring Ken Sugisaki and Yoshiki Nakameguro, a megane classmate of theirs. She also wrote the wiki tutorial for a game named "Chasseur Monstre" which means "Monster Hunter" in French.