Setouchi Idol Festival is a live event bringing together nine idol groups active in the Setouchi area, staged at the Sub Hall of the Ehime Prefectural Culture Hall in Matsuyama, Ehime. In addition to the stage starting at 11:00 a.m. on the day, there will be bonus events, meet-and-greets, and photo sessions, making it a day where fans can enjoy close interaction with their favorites. The lineup also includes STU48, and the event—offering a taste of the Setouchi idol scene—will be held on Monday, February 23, 2026 (a public holiday).