Sizuk

Sizuk is a Japanese music project led by composer Shunryu, with a focus on anime and idol music. Shunryu debuted as a composer in 2007 and has since written numerous songs in the field. Sizuk develops that background through a collaborative format rather than as a conventional solo act. Its releases bring together singers, songwriters, arrangers, and illustrators. As a result, the project changes from release to release in vocal tone, arrangement style, and visual concept. Sizuk has contributed theme songs to several anime works. Its opening themes include "Dystopia" for "Hyouken no Majutsushi ga Sekai wo Suberu", "Daybreak" and "Lover's Eye" for "Kekkon Yubiwa Monogatari", and "Gliding Claw" for "Reincarnated as a Dragon's Egg". It has also performed the ending themes "Thankful" for "Egao no Taenai Shokuba desu." and "Rei (零)" and "Zero" for "Reincarnation no Kaben". In 2025, Sizuk further expanded its anime profile with music video releases tied to the ending song of A Mangaka’s Weirdly Wonderful Workplace and the opening song for Tales of Wedding Rings Season 2.