Shoin's appearance causes a big fuss among all the residents of Astro Lodge, except Ren, who is more worried about his field trip.

Takumi and Aoi head to the Insect Festival, only to be roped into an unexpected event supposedly involving the key Mira's looking for.

Takumi has no idea how to interact with Aoi after her outburst, and the Wakabayashi family have a falling-out.

The gang finally finds a lead to the key! At the same time, it also means Mira’s departure is getting closer. How will Takumi and the other Astro Lodge residents react to the news?