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)

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

Special bundled with the DVDs. Please note that this entry doesn't include any of the official AMVs, as those don't contain any new animation.

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

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.

Maiku Kamishiro's past has always been somewhat of a mystery to him. The only clue he has to who is family might be is an old photograph showing two young children, a boy and a girl, playing in a small pool outside of a blue house. In an attempt to find his family, he moves to this blue house and begins working as a programmer. He's living a comfortable life until the day two very different girls show up at his door, both in possession of the same photograph, and both claiming to be his twin. With no way to prove who is a relative and who is a stranger, Maiku allows both girls to move in with him until they know for sure. 
(Source: Anime News Network)

New Onegai☆Teacher anime project initiated after the 20th anniversary of the series and the closure of Lake Kizaki Capeground.

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