Happy☆lesson (tv)

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: First episode is a re-edited version of the alternative OVA series' 1st episode, Dokidoki☆Mama Teacher.