Ryuji 'the Unicorn' / Doctor intervenes when the pachinko parlor manager reacts to Momoko’s winning jackpot and helps defend Momoko and Ichigo. Ichigo falls in love with him, but later discovers that he is Akimi’s fiancé. His brief involvement creates a romantic complication within Ichigo’s story.
Highly intelligent alien parasite that bonds with Shinichi in a symbiotic partnership.
Minor but pivotal supporting character. Likely a teacher or social service worker who intervenes to help Shūhei return to school and challenges Akiko's harmful influence.
Eiji Kure is the scientist who develops MySon, a chemical that transforms pain into pleasure and raises resistance to injury. He tests it on three women, including Rika Mikami, while romantically desiring her. Even after discovering the experiment's deadly effects, he continues observing, and Rika ultimately stabs him to death.
Abandoned by his father as a boy, Yuta grows up as the foster son of a restaurant owner and takes over the restaurant after the owner dies. Known as Yama-chan for his cheerful, helpful nature, he sets out to find his previously unknown baby brother, Yusuke, whose life and career are disrupted by Yuta's arrival.
Jinya Sano is a man in his fifties, about fifteen years older than Towako Kitahara, who supports their household through hard work as a blue-collar worker. He silently endures Towako's abuse, but when he spies on her leaving a love hotel, she suspects he caused Shunichi Kurosaki's disappearance.
Gōyan is one of the monsters involved after the human child is discovered on Monster Island. Along with others, he takes part in attempts to care for or move the child, as the group struggles with the danger of contact between humans and monsters. His role supports the wider effort surrounding Naki's bond with the child.
Yokai ally accompanying Tadashi
Dr. Kaieda is an archaeologist searching for the pieces of the legendary stone and the father of Shoko Kaieda. He is attacked during his quest and later revealed to have been possessed by the story's black-clad antagonist. Shoko's pleas help him break free, allowing him to reveal his true form before the heroes and their allies defeat the threat.
A convicted serial killer sentenced to death, previously running a bakery. He contacts Masaya via a letter, confessing to eight murders but firmly denying involvement in the ninth. His mysterious past and the letter serve as the catalyst for the entire investigation.
An Aomori apple farmer who becomes determined to grow apples without pesticides after his wife becomes ill when the orchard is sprayed. Despite years of failed experiments, mounting debt, and a devastated harvest, he continues searching for a natural method, eventually changing his approach by working with the soil and surrounding ecosystem.
One of the core residents, later famous as half of Fujiko Fujio. The film portrays his early struggles, creative process, and close working relationship with his roommate, highlighting his determination despite financial and artistic challenges.
Sadao Abe has 97 screen credits in a career dating back to 1994. Their work spans 10 cinematic universes — most prominently Unfair Collection with 7 titles. Signature works include Their Marriage, Extremely Inappropriate!, fukusuke. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
Universe traveler — spans 10 universes
Related entry on Wikidata (Q31768), public domain (CC0).
