Please☆Teacher: Marie Love Theater

Kei and Mizuho are having some marital difficulties, and Mizuho's family decides it's high time for a visit.

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.

An hour long OVA summarizing the plot of the original Onegai Teacher series. Also bundled with the BD box release of Onegai Teacher.

Special episode 9.5.