Mitsudomoe

Newly hired teacher Satoshi Yabe begins his job teaching class 6-3 and soon becomes aware of the terrible Marui triplets, Mitsuba, Futaba and Hitoha. When the triplets notice Yabe might have a crush on the new school nurse, Aiko Kuriyama, they purposely try to injure his groin in the hope that Kuriyama will like what she sees. When Yabe incidentally gets injured after running into Kuriyama, she confuses him for a fourth grader (she's blind without her glasses). Yabe gets the class a pet hamster, which Hitoha names Nipples and becomes attached to. When others start to play with her too much, Hitoha starts becoming defensive.

The series begins with an episode of Serious Sentai Gachiranger, in which the evil Gedol Empire try to eliminate children from the Saitama District so it will be easier to invade, using a monster named Crabron to turn everyone into a pile of bubbles. The Gachirangers hear about this and set into action, but seem to screw up at every opportunity. The Gachirangers later confront Crabron, culminating in a giant robot vs. monster duel. Upon defeating him, all the children return back to normal. Meanwhile, Hitoha is frustrated that the episode was filled with a lot of stupidity compared to the usual.