Nanatarou Yamada

Mizuki's roommate and the heir to a lingerie company. He knows Mizuki is physically female, but not that he was gender bent and he decides he wants to make "her" his wife.

In the past, Nanatrou was bullied over his father's line of work. However, after a certain recent event, he had a change of heart and is now obsessed with it. He insists that he must wear any lingerie before he can put his seal of approval on it, and is seen as an exhibitionist by those around him due to him being in his underwear on a semi-regular basis.