I Wanna Be Your Ghost

"I Wanna Be Your Ghost" (Japanese: 異世界混合大舞踏会, Hepburn: Isekai Kongō Dai-butōkai; lit. 'Grand Stage of Parallel Worlds') is a song by Japanese singer-songwriter and musician Gen Hoshino from his fifth studio album, Gen (2025). It was released as a digital-exclusive single by Speedstar Records on July 18, 2022. The song was written and produced by Hoshino, who co-arranged and programmed it with Mabanua. Musically a J-pop and dance track with electronic instrumentation, it was commissioned for the film Yokaipedia  (2022), a live-action adaptation of a children's book series by Kodansha; the production team asked Hoshino for a song to represent the world of ghosts from the movie. Lyrically, Hoshino sings of breaking the barriers of the worlds of humans and ghosts. The song features background vocals performed by voice actors Rie Kugimiya, Hiro Shimono, and Tomokazu Sugita, who portray the ghosts in Yokaipedia.

"I Wanna Be Your Ghost" was received positively by Japanese music critics for its production style and drew comparisons to Hoshino's preceding single "Comedy" (2022). Upon release, the song debuted at first place on the digital download component charts of both Billboard Japan and Oricon, while it reached numbers six and twenty-six on the parent Japan Hot 100 and Combined Singles charts, respectively. The accompanying animated music video—featuring a boy dancing with ghosts—was produced by the studio Outline, led by director Yūki Igarashi. Throughout 2022, Hoshino promoted the song with performances on the Spotify video series Go Stream and on the Christmas special of CDTV Live! Live!. Dressed as his alter ego character Akira Nise, Hoshino first sang it in front of a live audience as the closing song of his Reassembly tour in 2023.