Invaders of the Rokujouma!?

Season 1, Episode 12: Invasion, A-OK!?

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It's December, and they've finally all gotten used to living each other in Apt 106 at Corona House. Koutarou suddenly starts a secret part-time job, even though he's about to start practicing for the second half of the Blue Knight play. The girls all wonder if he got a girlfriend, and start getting jealous. Just what will happen?!