Hashiba Hayase is a Japanese manga artist and original creator, with professional activity documented primarily between 2003 and 2006. The creator’s name in Japanese is 速瀬羽柴, with the romanization Hayase Hashiba.

One of the earliest credited works is the one-shot manga Futari, published on November 28, 2003, for which Hayase served as both author and illustrator. The creator is perhaps best known for association with the Simoun franchise. While the Simoun anime is an original work, Hayase wrote and illustrated the official manga adaptation, which was serialized in Comic Yuri Hime magazine and published by Ichijinsha as a single volume in 2006. Hayase also created Simoun Magical Biyuden, a related work published by Gakken in Megami Magazine around the same period.

Beyond these titles, Hayase’s published manga include marriage black, and the artist has contributed works to magazines such as Manga Bangaichi (published by Core Magazine) and Comic Yuri Hime S (published by Ichijinsha).

Regarding artistic identity, Hayase’s work is characterized by a tendency to depict characters with black hair, which sometimes gives the visuals a darker impression. Thematically, the creator’s stories range from legendary or supernatural tales to narratives focused on the emotional struggles of youth, with a foundation in pure love stories. Hayase is noted for detailed psychological portrayals and a tendency to depict strong-willed female characters. The creator has expressed a preference for avoiding scenarios where female characters are killed or injured and aims to portray characters who are lively rather than doll-like. Hayase uses the first-person pronoun ore.