STU48 (short for Setouchi48) is a Japanese Idol Group and the 5th sister group of AKB48. The group has their own theater on a boat. It started travelling through the Yamaguchi, Hiroshima, Okayama, Hyogo, Tokushima, Kagawa and Ehime prefectures in April, 2019. The 1st Generation members were announced on March 19, 2017. The debut single of the group, Kurayami, was released on January 31, 2018.