JP: 小樽潮風高校Project「小樽まちめぐりスタンプラリー」

A stamp collection event run by the city of Otaru, Hokkaido in collaboration with Tokyo6 Entertainment. The illustrations for the stamps were provided by the artist moyasiwhite, depicting Koharu Rikka, Natsuki Karin, and Hanakuma Chifuyu at various real world locations around the city.

Four new stamps were introduced in 2023 for the 3rd run of the event: the Hotel Torifito bathhouse stamp, the Grids Premium Hotel Otaru stamp, the Old Aoyama Villa stamp, and the Takinami Donburi Restaurant stamp.