One man. There are five females. All under one roof. It's an old notion, yet it never goes out of style. Happy Lesson is a dynamic reimagining of a classic genre. Chitose lives with five females in his home. One could believe that the continual attention of so many girls is a good thing, but too much attention can be hurtful. Did I mention they teach at his school (thus the title)? He is the target of their abuse not just at home, but also at school. Even when things finally settle down at night, all the rooms are occupied, forcing Chitose to sleep on the sofa.