Sakanaction's 'Kaijuu' Dominates 2025 JOYSOUND Karaoke Chart, Setting Record as Top Anime Theme

The Japanese music industry is currently focused on the alternative rock band Sakanaction, which has achieved the top position on the highly competitive 2025 JOYSOUND Anime Karaoke Chart. Their single, “Kaijuu,” has been officially recognized as the most popular anime karaoke track of the year. This success confirms the band's significant crossover appeal within the dedicated anime community. Notably, “Kaijuu” represents Sakanaction’s first collaboration with the anime industry, having served as the opening theme for the acclaimed NHK series, Chi: About the Movement of the Earth.

Released on February 20, 2025, the track demonstrated immediate commercial strength. “Kaijuu” quickly dominated streaming platforms, securing the No.1 position on the Oricon Daily Streaming Ranking. Furthermore, its debut on Spotify Japan was record-setting, achieving the highest number of streams for a release day and approaching two million plays. This high demand highlights the song's broad appeal, driven by Sakanaction's characteristic blend of complex electronic elements and powerful rock dynamics, which effectively complements the intellectual nature of the source material.

Adding to the song's widespread resonance, frontman Ichiro Yamaguchi disclosed that the composition of “Kaijuu” occurred during a period of personal difficulty. This infusion of genuine emotion has evidently established a strong connection with listeners, propelling its success beyond initial commercial expectations and integrating it deeply into Japan's karaoke culture. Fans interested in experiencing the track live are currently attending the Sakanaquarium 2025 “Kaijuu” tour, where the band is performing the hit single alongside their extensive repertoire across major Japanese venues.

The 2025 JOYSOUND chart results underscore that anime music remains a significant driver of cultural trends in Japan. While Sakanaction holds the top spot, the chart features a competitive and robust lineup, with celebrated artists such as Mrs. GREEN APPLE and Kenshi Yonezu occupying the subsequent high positions. This intense competition at the top of the chart confirms a highly energetic anime music landscape, promising continued innovation and productive synergy between Japan's leading contemporary musical talent and the thriving anime industry.