Kusanagi Kei, a high-school student living with his aunt and uncle, has an encounter with a female alien. This alien is revealed to be a new teacher at his school. Later, he is forced to marry this alien to preserve her secrets. From there, various romantically-inclined problems crop up repeatedly.
Yumi Takada is a Japanese voice actress affiliated with 81Produce. She uses the alias Saki Iijima for adult work. Iijima Saki is an alias used by Takada Yumi for adult work. Not to be confused with the casting director with the same name.