The letter from Mira's mother tells all about her connection with Shimotakaido Tasuke, which leads the gang to try to learn more about him in earnest.

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?

Inspired by everyone's hard work, Yu makes a commitment to pursue her dream with equal vigor.