青葉 七海

As the daughter of Ibuki's landlord, his senpai at college and more importantly his lifelong friend, Nanami feels an obligation to look out for him. She can't seem to make up her mind whether she's going to act like his older sister or his wife. When Ibuki's apartment starts to fill with other girls, she senses that her relationship with him may be threatened. [Edited from Wikipedia and Ben Woodhouse's Walkthrough]