June 9 holds a special place in Japanese pop culture as Rock Day—a celebration built on wordplay where the numbers 6 (roku) and 9 (ku) sound like "rock" in Japanese. This year, the anime community embraced the occasion with enthusiasm, with studios and creators sharing rock-themed tributes across social media.

Barbapapa kicked off the celebrations by transforming into a guitar, complete with an adorable wink, encouraging fans to "rock out." Bonobono highlighted its second theme song, "Bonobono Rock 'n' Roll," performed by artist MBB, inviting viewers to spend the day rocking along. One Piece's Chopper character (via the official Chopper's account) declared their determination to learn guitar, while Girls Band Cry—an anime centered on music and band dynamics—kept things simple with a rock-themed post.

Beyond anime studios, the celebration extended to individual creators and related media. Voice actress Minori Chihara shared her own Rock Day tribute, while manga artist Atsushi Kamijou posted an illustration titled "If I Don't Dance I Cry," playing on the day's musical theme. Precure creator Futago Kamikita released rocking artwork of beloved characters from across the franchise, from Suite Precure to Hugtto! Precure.

Even gaming crossed over into the celebration. Haibara's Teenage New Game+, currently airing with episodes available on streaming services like dアニメストア and U-NEXT, joined in with rock-themed content. Video game producer Masanori Ichikawa used the occasion to celebrate Rocbouquet, a character from the SaGa series, with a playful acknowledgment of the name's connection to Rock Day.

These celebrations highlight how Japanese pop culture embraces wordplay holidays. Rock Day gives anime studios and creators a fun excuse to connect with fans through shared cultural moments, whether through official studio posts or personal tributes from industry veterans. It's a reminder that even in anime, music and rock culture remain central to the medium's identity.