Hitotose Chitose was always alone and untrusting of people but when 5 female teachers appear and started living together with him in his family's house as his mothers, things started to change and pick up, together with Hazuki-nee and Minazuki (his 2 sisters) everyday is a lesson. (Source: Anime News Network) Note: Additionally aired as the 9th episode of HAPPY☆LESSON ADVANCE, with an updated opening and ending to match the season, as well as some minor changes to the episode itself.