Onegai Teacher! (Or “Please Teacher!” or “Onegai Sensei!”) is an anime custom-built by specifications. It has exactly what is expected of an anime of the genre, and is especially targeted at adolescent boys and/or otakus. It is basically, a wish-fulfillment series.
It does that very well, but naturally does very little else.
This is a “Things I Like” post, and as such, it’s not a review per-se, but my thoughts on the series. Spoilers should come as no surprise, but this post will have relatively few if any.