HAPPY☆LESSON ADVANCE: Bau Bau★Kanna no X'mas Soudou

Hitotose Chitose is now living together with his 5 teachers as his mothers when a mysterious girl appears and becomes their neighbor which turns out that that person is Nagatsuki Kuron who wants Mu-chan to be her mother so another sibling rivalry ensues as to who would end up as Mu-chan's child. Note: During the original broadcast, the episode Hoka Hoka★Kanna to Futari Kiri, first included as an unaired special in the 6th DVD volume of HAPPY☆LESSON (TV), was also aired as the 9th episode of this season, with updated opening and ending to match the current season, as well as some minor changes to the episode itself.

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

When Mitsuki learns that the highschool is going to destroy the old school building, she is saddened at the thought of so many memories being erased. Chitose and the rest of the moms spring into action to stop the demolition. During their efforts, Fumitsuki, Chitose, and Mitsuki finally realize their true feelings.

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.