Yoshikazu Hamada is a Japanese manga artist and illustrator known for creating the supernatural action series Tsugumomo. Born in 1977 in Saitama Prefecture, Hamada began his creative career by participating in Comiket with self-published works in December 1997, followed by the start of his commercial activities in April 1999. His early professional work included providing illustrations for the series Shin Sword World RPG Replay published by Fujimi Shobo in 2001, and his first serialized manga, Heppoko Bouken-tai, was released as a compiled volume in 2005.

Hamada is best recognized as the sole author and illustrator of Tsugumomo, which stands as his most significant and long-running work. The series began serialization on November 20, 2007, in the web magazine Comic Seed! published by Futabasha. Following the closure of Comic Seed!, the series moved to WEB Comic High! in August 2008 and eventually transferred to the print magazine Monthly Action upon its launch in May 2013. After Monthly Action ceased publication in February 2024, the series continued on the web Action platform, resuming in March of the same year. As of August 2024, the manga has been compiled into thirty-three tankobon volumes, with the first volume released on June 28, 2008.

The success of Tsugumomo led to its adaptation into two anime television series. The first season, simply titled Tsugumomo, was produced by the animation studio Zero-G and aired for twelve episodes from April 3 to June 19, 2017. A second season, titled Tsugu Tsugumomo, premiered on April 5, 2020, and also ran for twelve episodes, concluding on June 21 of the same year, with the primary cast and production staff returning. Both seasons were directed by Ryōichi Kuraya, with Yasuharu Takanashi composing the music.

Thematically, Tsugumomo is a seinen manga that blends supernatural fiction, romantic comedy, and harem elements. The narrative centers on Kazuya Kagami, a young boy who inherits a treasured obi sash from his late mother, which manifests as a tsukumogami—a sentient object spirit—named Kiriha. The story explores concepts of Japanese folklore, particularly the nature of tsukumogami and the bonds between humans and spirits. Recurring themes include the handling of loss and inherited legacy, as Kazuya's journey is deeply connected to uncovering the truth about his mother's past and his own mysterious childhood. The series is also noted for its detailed battle sequences and a significant amount of fan service.

In the broader industry, Hamada is primarily recognized for the longevity and dedicated following of Tsugumomo. His career reflects a transition from doujinshi circles to successful commercial serialization, and his work has been published internationally, including an English release through the now-defunct JManga service and an Italian edition by Nippon Shock Edizioni.