Tsukishima, Chuo City, Tokyo. The 'Takamimi Shrine' has a history of over 400 years dating back to the Edo period. The deity enshrined there is Eldar, an elf who was summoned by Tokugawa Ieyasu from another world and has completely become a recluse. The shrine maiden serving him is Koganei Koito, a high school girl who often tries to stretch herself taller. They go to Toyosu to eat sushi, feel nervous about price negotiations, enjoy riddles, scold the newly rich, reminisce about the days when she wore smaller shoes, and sometimes get called 'sister' by mischievous kids, all while time flows leisurely along the Sumida River.