__Height:__ 170 cm 
__Status:__ Galaxy Federation resident observer

Miss Mizuho Kazami is no ordinary high school teacher. She is actually a resident observer for the Galaxy Federation. Right after she lands on Earth, Kei Kusanagi sees her materialize. The next morning by the lake, he discovers that she is his homeroom teacher, and his neighbor. After getting caught alone in the supply room at school late one night by Kei's uncle, aunt, and the principal of the school, Kei's uncle announces that the two were secretly married. Then Kei reveals he is actually 18 years old instead of 15.  Mizuho has many different personalities. Though she is 23, and her father was human, she knows little to nothing about Earth except a love of the best candy in Japan. She has two living relatives, her mother and sister. Her sister, Maho, threatens Kei every time she sees him, and more than once tried to kill him. Mizuho's mother, Hatsuho tries to show Mizuho many sexual tricks.

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)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.

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)

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.

Two weeks have passed since the dilemma between Maiku, Karen and Miina was resolved, but their lives are more hectic than ever. Karen has become possessed in her newly discovered brother and Miina is desperate for attention as well, which leaves little time for Maiku to concentrate on his work. Therefore he decides to head out in the woods and set up a camp, where he can be work in peace. But, as always, we have Morino who is up to no good. To make things a bit more interesting, she organizes a field trip to Maiku's camp site, and encourages everyone to make some good summer memories.

Maiku Kamishiro has a problem. Actually, make that two problems. He has two young girls boarding at his house, each claiming that they're his long-lost twin sister! Which one is Maiku's sister? Which one is a total stranger?