Kusanagi Kei, a high school student living with his aunt and uncle, encounters a female alien who turns out to be a new teacher at his school. He is later compelled to marry this alien in order to protect her secrets. This leads to a series of recurring romantic complications.
The manga Onegai☆Teacher was published in English as Please Teacher! by ComicsOne from February 25, 2003, to June 17, 2003. It was also released in Brazilian Portuguese by Editora JBC from August 2005 to September 2005.








I regret to say that the Onegai Teacher manga turned out to be quite a letdown. Contrary to what usually happens, this manga was adapted from the original anime, and in my view, the adaptation wasn't handled well. Several elements from the anime are absent (for instance, the character of Hatusho is barely featured in the manga), and there were substantial alterations to the plot, all of which diminished the overall quality.
My recommendation is to stick with the anime and skip the manga altogether.
Unlike the negative reviewers, I found the Onegai Teacher manga to be absolutely fantastic. It was so great that I gave it a perfect 10/10 rating. The only other manga that achieved this high score for me was Air Gear, which has everything a Shounen fan like myself could want. So why did Onegai Teacher have such an impact on me, even though it isn't classified as Shounen? Here are my reasons, though you don't have to take my word for it. Please give the manga a try and see for yourself.
To provide some background about my preferences in anime and manga: I enjoy watching and, since 2008, reading dramatic works, particularly hentai manga. The slow build-up of the plot leading to the climax and then the finale must be clear and thorough. Onegai Teacher excels in presenting this structure in manga form. While the manga might not include certain scenes from the anime, like the beach arc or parts with the male Sensei (the plane enthusiast), it doesn’t fall short in delivering the intended drama and fan support. Moreover, unlike the anime, the manga doesn’t end on cliffhangers, as far as I can recall.
The manga's strengths extend beyond just the plot. Other aspects surpass the anime it’s based on. For instance, puns. As someone who understands Japanese verbal humor well, especially puns, the anime disappointed with weak acting. When you’d expect improvement, it fell flat. In contrast, the manga presents these puns clearly and entertainingly. My only disappointment would be the lack of "ecchi" content or nudity, like in the anime OVA, but the compelling drama compensates for this. By the end, I was nearly moved to tears by how it concluded, and I probably would have cried if I were listening to a melancholic tune. I wish more anime and manga companies would produce dramatic stories like this, especially those involving teacher/mother and student/son scenarios.
In summary, using MAL’s rating system, the story, characters, and enjoyment all deserve perfect scores. The art could have been slightly better, but considering its time, it was average. Overall, I stand by my initial statement at the beginning.