Happy☆Lesson
Genres: Comedy, Romance
Type: OVA, Episodes: 5
Aired: Jul 19, 2001 to May 23, 2003
Studio: Studio Kyuuma, Venet, Chaos Project
Source: Unknown
Rating: PG-13 - Teens 13 or older
Synopsis:
One guy. Five girls. One roof. It's a recycled idea, but it never gets old. Happy Lesson is a kinetic take on an old genre.

Chitose shares his house with five ladies. One might think the continued attention of this many girls would be a good thing, but too much attention can prove to be painful. Did I mention they're also instructors at his school (hence the title)? Not only is he the subject of their abuse at home, but at school as well. Even when things finally calm down at night, all the rooms are taken so Chitose must sleep on the couch.

(Source: AniDB)