Umaru, aka UMR, is a force to be reckoned with in the arcade. She’s invited to participate in a fighting game championship only to bump into her school rival, Tachibana.

In the Doma household, winter means lazy days beneath the kotatsu! Umaru reflects on her interesting year while Taihei tries to collect on a promise she made to him.

Umaru and Ebina discover that their appetites match, the council in Umaru’s head furiously debates about the perfect snack, and Taihei tries to get Kirie excited for summer.

Umaru spends Christmas evening with her friends, and Sylphyn remembers a childhood Christmas wish. On New Year's morning, Umaru receives a suspicious gift from Taihei.

Umaru and the gang have a spontaneous get-together, but when things don't go as expected, hilarity ensues.

Sylphin invites UMR over to her house, where a slight misunderstanding leads to some awkwardness. Later on, Umaru seems to have found a weakness in Hikari’s armor.