Even the cats are running around in December!

November 11th is Yanineko's birthday. She thought there would be no one to celebrate with her—but it turns out her younger sisters had planned a surprise party. They're kind of nice. However, a mistake in contacting Yanineko herself is discovered... Meanwhile, in the winter apartment, the landlord is somehow trapped in a terrifying "New Year's mochi-making loop." To defy the law of the cycle and change fate—rise up, landlord! Swing him around, landlord! Slam him down, landlord! No matter what—!