On the morning of a very warm day, Nano's hand shoots off like a rocket while she is stretching outside, and she begins to chase it. Yūko tells various jokes to make Mio and Mai laugh, but she is devastated by the fact that none of them succeed. Misato tries very hard to hide her feelings for Kōjirō, however her embarrassment gives her away, and she eventually get hit in the head with Nano's flying hand. Then, Yūko, Mio, and Mai become stuck in an elevator, bored and with no hope, when Mio and Yūko suddenly go into a laughing fit. The Professor gets in trouble for eating a snack before bedtime, and Nano becomes upset when she hears she has no need to brush her own teeth because she will never get cavities.