collecting songs from these three albums and some new covers, was released on January 20, 2010. Demon released Mythology, his first original studio album in nine years, on May 16, 2012. It features several guests, including Yuki Koyanagi and May J., and a song composed by Tetsuya Komuro. The album's June tour featured Koyanagi at every date, while its final day also saw the other contributors perform. Demon wrote and composed the 2013 song for the idol group Kamen Rider Girls. For his March 2017 album Existence, Demon had two Akutagawa Prize winning authors (Keisuke Hada and Yū Nagashima) and Terra Formars author Yū Sasuga write song lyrics. His November 2017 album Utadama was built around folk instruments, pianos and other unplugged instruments and includes covers of songs such as "Furusato" and "Kimigayo". His November 2019 album Uta Dokuro: Gekida☆Shinkansen Gekichūka-shū is a collaboration with the theater company Gekida☆Shinkansen, with whom he has written lyrics for and performed songs with since at least 1995. The album features Demon singing 12 songs he wrote for the company's plays over the last 24 years with some altered lyrics. Demon collaborated with Arika Takarano (Ali Project) for the May 13, 2020 single , which is the opening theme of the anime adaptation of The 8th Son? Are You Kidding Me?. That same year, he provided the song "Naked Men Miro, Hadaka no Oretachi o!" to the stage adaptation of Reiko Okano's sumo manga series Ryōgoku Hananishiki Tōshi. Sumo Demon dedicated a section of his radio program Demon Kogure no All Night Nippon to sumo. The section, called , often featured interviews with active rikishi, most notably Daitetsu Tadamitsu, who became friends with Demon. Demon wrote a column for the sumo magazine Van Van Sumo Club for 13 years, and was a regular guest commentator on the J Sports TV show Gekisen! Ōzumō for five years. But he was asked not to enter the Ryōgoku Kokugikan in costume so as not to cause a distraction, and complied. However, in 2005 Demon was asked by the Japan Sumo Association to be a guest on Dosukoi FM, the live in-house radio broadcast of sumo tournaments, and to come in costume, ending the ban. The following year Demon was a guest commentator for NHK's television broadcast of the January 2006 honbasho, and became the first guest to commentate an entire sumo tournament. Demon was a guest commentator