Umaru’s sulky, glaring classmate, Motoba, has unexpectedly shown up at her door… while she’s wearing her hood! Is her secret out?

People in his office have seen Taihei walking home and going shopping with a hot girl! His coworker comes over for a visit to see this so-called “sister” for himself.

Umaru gets sick, but it’s a good thing her germs are as lazy as she is! Sadly, her germs show her brother no mercy. Later, Taihei remembers a day at the arcade, 10 years ago.

Umaru and the girls head out to spend a fun day at the amusement park, but Kirie is having a few struggles. Will the day end up a total disaster?

After Bomba gives Taihei one of his old cameras, Taihei spends sometime reconnecting with Umaru. Later, the tension between Hikari and Umaru increases.