Japanese singer Sou released a music video for his latest digital single song "Q.E.D." on his official YouTube channel . The pop tune is now featured as the opening theme for the winter 2026 TV anime The Case Book of Arne . Sou "Q.E.D" Music Video The Case Book of Arne Anime Creditless Opening Movie Ver.Lewis Sou began his singing career by uploading videos to Nico Nico Douga in 2013 and achieved a major label debut in 2015. To date, his YouTube channel has over 1.69 million subscribers, and his total social media followers exceed 2.5 million. His previous anime theme song works include "Mister Fixer" for ID: INVADED (2020), "Nero" for Dead Mount Death Play (2023), and "Tada, Kimi no Mamade" for ZENSHU (2025). "Q.E.D" released digitally on January 8, and will also be included in Sou's upcoming fifth album "Panorama" to release on March 4. "Q.E.D" digital jacket "Panorama" regular edition CD jacket "Panorama" first press limited edition A CD jacket "Panorama" first press limited edition B CD jacket Sou artist visual RELATED: The Case Book of Arne Anime Releases New Trailer, Key Visual The Case Book of Arne Anime Trailer The TV anime adaptation of the mystery adventure game The case Book of Arne premiered in Japan on January 6, 2026. The anime's first episode " Those Who Dig Pits for Others Will Fall in Themselves" is now available on Crunchyroll for Premium members in N orth America, Central America, South America, Europe, Africa, Oceania, the Middle East, CIS and India. Crunchyroll describes The case Book of Arne as such: Louis Hartmann loses his father, a private detective investigating a string of murders, leaving him all alone. Rumor has it that the murders are the work of a Grave-Digger Vampire. Louis isn’t keen on superstitions and vows to catch the culprit himself. That is, until a self-proclaimed detective, Arne Neuntöte, and his assistant, Lynn Reinweiß, appear. A new door is about to open for Louis… Source: Sou official YouTube channel
