is a Japanese light novel author. He is best known for writing The Tunnel to Summer, the Exit of Goodbyes novel and The Mimosa Confessions series.
Hachimoku was born in Himeji, Hyà Âgo Prefecture. He grew up in the remote area of Kansai. While attending high school, he started writing derivative works of his favorite manga and video games. His debut work won both the Gagaga Award and the Special Jury Award at the 2019 . It was later released under the title The Tunnel to Summer, the Exit of Goodbyes. He was inspired to write it by the Interstellar film. The novel was adapted into a manga and an anime film.
His second work, The Mimosa Confessions series, ranked second overall among the new series of 2022 in Takarajimasha's annual light novel guide book Kono Light Novel ga Sugoi!. The series, which features a transgender woman as one of the main characters, was praised for its positive portrayal of sensitive LGBTQ subjects. It was published in five volumes from July 2021 to June 2024.