OVA Episode 1 - Nagasumi appears in a strange place.. Sun, Lunar and Akeno are starting their senior year, Nagasumi is fighting for his life, while the girls are fighting for their humiliation. Gouzaburou is still their teacher, and Edomae is still dressing like a girl. It's still full of references. The whole first episode is basically one massive reference. OVA Episode 2 - Akeno is a maid! She accidentally caused some damage, and had to get a job to pay off the debt.Sun, Mawari and Lunar join in too.

In the second part of the episode, something weird starts happening... Ghosts?

Both OVAs are a good ending to the season.