K-pop group LE SSERAFIM (members: Kim Chaewon, Sakura, Huh Yunjin, Kazuha, Hong Eunchae) performed at Japan's largest music festival 'Summer Sonic 2026' on August 14 at Osaka Expo Commemoration Park and August 16 at Chiba Zozo Marine Stadium, showcasing their accumulated live performance capabilities. Despite challenging weather conditions including extreme heat and rain, audiences demonstrated high expectations with official merchandise sales before the show. LE SSERAFIM performed 14 songs without interruption over approximately one hour with a live band session, including 'CELEBRATION', 'Creatures', 'HOT', and 'Perfect Night'. Notably, during signature songs 'CRAZY', 'SPAGHETTI', and 'ANTIFRAGILE', crowd participation reached its peak. Pentatonix member Scott Hoying shared the 'CRAZY' point choreography video on personal SNS with praise, while Pentatonix's official account called LE SSERAFIM an 'iconic group', demonstrating cross-genre interest. On-site audiences praised the group for their stable vocals and stage manners. After completing tours in Miyagi and Fukuoka, LE SSERAFIM plans to expand to the U.S. stage, sequentially performing at BlizzCon 2026 closing ceremony, U.S. tour, and iHeartRadio Music Festival while continuing their skill-based expansion.