Deciding his obesity needs to be addressed, Tamako, Choi and the others decide to put Dera on a mochi-free diet until he loses enough weight to fit into a birdhouse Kanna made. In order to keep watch over Dera to make sure noone feeds him, Choi goes to school with Tamako and the others, where she joins in on classes and helps Dera get some much needed exercise, before going to a used clothes store. As Dera shows up the next day with a curiously slim body, Kanna and Midori give Choi a sweater they made for her.

As word spreads about Tamako allegedly being a princess, Tamako herself is more focused on collecting enough loyalty points to receive a medal from the shopping district. After Tamako earns her medal, Choi manages to fix Dera's communication features and get in contact with the prince, Mechya, who exchanges some words with Tamako before Dera breaks down again. Whilst Tamako herself feels she's not really a princess, the neighbourhood have a meeting concerning Tamako, feeling she should probably go, although Tamako herself feels otherwise. The next morning, Tamako panics when she can't find her medal, only to be given it by Mechya himself.