Kei Kusanagi

Height: 155 cm

Kei is living the life of a fifteen-year-old boy. He has a unique disease that causes his body to shut down into a death-like state whenever he becomes too stressed or depressed. He calls this a "standstill". The amount of time he remains in a standstill is random, usually lasting a few minutes to a few hours. However, one time, he went to a standstill and didn't come out for three years. So although everyone thinks he's 15, he is really 18. He discovers that his new teacher, [Mizuho Kazami](https://anilist.co/character/2763), is actually an alien whose mission is to observe Earth. Due to a big misunderstanding, Kei has to choose between letting her secret out or getting married to her.