List of Idol Festivals Nationwide [2026]

“Idol Hatsugatsuo Festival Kochi Main Fest 2026” is one of the twice-yearly Kochi-born events in the “IDOL Katsuo Tataki Fest” series, organized by the Umami Components Research Society. Set at BAY5SQUARE in Kochi City, it’s a local idol festival with sister events such as the Osaka Business Trip Tataki Fest and Mikan no Rokurou. A diverse lineup including LØISLOID, lonlium, and Narukami gathers to showcase the region’s charm through unique programs centered on the symbol of skipjack tuna. The main festival in April 2026 will turn up the heat.

This is the main Kochi edition of the twice-yearly idol festival “IDOL Katsuo Tataki Fest.” Organized by the Umami Components Research Society, it presents a unique concept that fuses Kochi’s bonito (katsuo) culture with the underground idol scene, and also features a sister event, the Osaka touring edition “Rokurou Osaka Touring Tataki Fest.” The venue is BAY5SQUARE on Sambashi-dori in Kochi City. It’s a day bringing together a diverse lineup of idols such as lonlium, Narukami, and Cosmoslay, scheduled for April 2026.