It's been announced that STU48 member Tanaka Kouko will graduate from the group.

This announcement was made during the group's drive-in Christmas live on December 23 at THE OUTLETS HIROSHIMA. The date of Tanaka's last day of activities as well as her graduation concert will be announced later.

Tanaka became an official member of STU48 in March of 2017. She was a senbatsu member for the group's debut single "Kurayami" released in January of 2018.