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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.
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Watch Onegai Teacher Online Free
You can watch Onegai Teacher (2002) online free in HD on AniWatch, with both English subbed and English dubbed options. All 13 episodes are available to stream, with new episodes added fast. This romance, sci-fi title is one of the most requested anime in its category.