Oh, My Sister

Sota's becomes depressed over how tall his younger sister is becoming and asks Polar to pretend to be his sister for a day in order to help him cope. Poplar agrees to this but their actions cause the other employees to think Sota has lost his mind. Seeing an opportunity to play tricks on Mahiru, who is jealous of all the attention Sota is giving Poplar, Hiroomi decides to help Mahiru prove her cuteness to Sota. Meanwhile, Kirio stops by to ask Mahiru to help him search for his long lost sister (Aoi) but Hiroomi sends Aoi off on an errand in order to play a prank on him.