Mailbox and manhole at Kappabashi featuring Sarazanmai
Sarazanmai is a popular Japanese anime television series created by Kunihiko Ikuhara and jointly produced by MAPPA and Lapin Track and aired on Fuji TV from April 11 to June 20, 2019 for eleven episodes. The anime is set in Taito Ward’s Asakusa, Kappabashi districts, Tokyo.
Crunchyroll, the company that syndicated Sarazanmai in English-language markets describes the story:
The setting is Asakusa. One day, second-years in middle school Kazuki Yasaka, Toi Kuji, and Enta Jinnai meet Keppi, a mysterious kappa-like creature, who steals their shirikodama and transforms them into kappas*. “To return to your original forms,” Keppi tells them, “you must fight the zombies and take the shirikodama from them.” Can the boys connect with each other and steal the zombies’ shirikodama?! At the same time, something is happening at the police box where Reo Niiboshi and Mabu Akutsu work. This is the story of three boys who can’t connect with someone important to them, learning about what it truly means to do so. (Source: Crunchyroll Press Release)
*Kappa (河童, river-child) are yokai demon in Japanese folklore.
A mailbox and manhole have been set up in the area to commemorate the Sarazanmai’s connection with Kappabashi.