Sou Releases New Digital Single & Music Video "Q.E.D."

Opening Theme for TV Anime “Arne's Case Files”

Japanese vocalist Sou, one of the most influential artists to emerge from the utaite scene, has released his new digital single “Q.E.D.” along with its official music video.

With over 1.69 million YouTube subscribers and approximately 620,000 followers on X, Sou continues to expand his global presence through his distinctive voice and expressive storytelling.

“Q.E.D.” serves as the opening theme for the currently airing TV anime Arne's Case Files, perfectly capturing the series' mysterious and suspenseful atmosphere.The song was written and composed by Yuri Kuriyama(栗山夕璃), featuring an enigmatic soundscape that enhances the anime's narrative tension.

The accompanying music video, animated by Nowoka(のをか)—who previously collaborated with Sou on the MV for “Nero”—depicts a whimsical, comedic puzzle-solving story in which a girl who wanders into a mysterious Western-style mansion struggles to solve riddles posed by its enigmatic owner. Viewers can actually solve the riddles that appear in the video, revealing a hidden message when all answers are combined.
“Q.E.D.” is also included in Sou's upcoming 5th full-length album Panorama, scheduled for release on March 4, 2026. The album will feature a total of 12 tracks, including previously released digital singles and brand-new songs.
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New Release Information
Digital Single: Q.E.D.

Now available on all major streaming platforms

Streaming Link
https://lnk.to/sou-Q.E.D
Music Video
https://youtu.be/7WGmWlaYMzI
TV Anime Arne's Case Files
Opening Theme: “Q.E.D.”
https://arne.asmik-ace.co.jp/

Album Information
5th Full-Length Album: Panorama
Release date: March 4, 2026
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Artist Profile
Sou

Sou began his career in 2013 by posting cover videos on Nico Nico Douga and quickly gained attention for his emotional vocal style. He made his major-labeldebut in 2015 and has since collaborated with prominent creators such as Nayutalien, Harumaki Gohan, and Eve.
His 2020 digital single “Mr. Fixer,” used as the opening theme for the anime ID:INVADED, topped overseas streaming charts for four consecutive weeks.

After joining King Records in 2023, Sou celebrated his 10th anniversary with a live concert Orbit and, in 2024, released his album Sense of Wonder, followed by his largest-ever domestic tour and his first successful tour in China.
With more than 2.5 million total followers across platforms, Sou stands as a leading vocalist who continues to bridge the internet-originated music culture with a global audience.

[Official Website] https://sou-official.jp/
[X] https://twitter.com/Nico_nico_Sou
[X – Staff] https://twitter.com/sou_staff_mg
[Official Fan Club] https://sou.fanpla.jp/