Kusanagi, Kei

草薙桂

Kei Kusanagi lives the life of a fifteen-year-old boy. He suffers from a unique condition that causes his body to shut down into a death-like state whenever he becomes too stressed or depressed. He refers to this as a "standstill". The duration of a standstill is random, typically lasting from a few minutes to a few hours. However, on one occasion, he entered a standstill and did not emerge for three years. Consequently, while everyone believes he is 15, he is actually 18.
In the anime, Kei discovers that his new teacher, Kazami Mizuho, is actually an alien whose mission is to observe Earth. Due to a major misunderstanding, Kei must choose between exposing her secret or marrying her (he chooses to marry her). Initially, he is hesitant about the situation, but eventually he falls in love. What follows are comedic and dramatic situations that he must overcome in order to live a happy life with his new wife.