A collaboration between the TV anime “100 Girlfriends Who Love You So, So, So, So Much” and the public bath “Oshiage Onsen Daikokuyu” in Sumida Ward, Tokyo, will take place from Friday, September 4, 2026, through Sunday, September 13, 2026.
Original medicinal baths inspired by Shizuka, Nagino, Ikumi, Momiji, and Yaku, as well as collaboration merchandise featuring newly drawn illustrations, will be available. For every 2,000 yen (tax included) spent on related merchandise, customers will receive one random postcard from a set of five.