Natsuki Shinohara- A popular 18-year-old high school student and a close friend of Kenji Koiso. She invites Kenji to meet her large extended family for her great-grandmother Sakae Jinnouchi's 90th birthday. She originally invited him because she had promised her great-grandmother to bring her a boyfriend/fiancé. This was because she was frantic, thinking Sakae was going to die and made a mindless promise. Her uncle Wabiskue shows up and the household falls apart. Her grandmother wanted him to leave, but Natsuki wants him to stay.