Another computer intelligence hologram, dressed in female-like clothing. The implication is that both [Marie](https://anilist.co/character/7254) and Miruru are in fact commlinks for the ships, themselves. In other words, the ships house self-aware AI's capable of emotions, which are reflected in the actions of the two miniature beings. Seems also to be romantically involved with Marie.

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. 
(Source: Anime News Network)

Michelle Suzanne Ruff is an American voice actress known for her work in anime and video games. Height 5' 3½" (1.61 m). Georgette Rose is the name of Michelle Ruff's mother, and Michelle used her mother's name as a pseudonym in her early career.

Kei and Mizuho are having some marital difficulties, and Mizuho's family decides it's high time for a visit.
 
(Source: Anime News Network)

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. (Source: Anime News Network) 
Note: 
-The title was never "- sensei," the Japanese characters phonetically spell "teacher". 
-The chapter count includes one extra chapter.