Kappei Matsumoto (松本 花っぺい, Matsumoto Kappei), born in Okayama Prefecture, is a Japanese mangaka known primarily for his most celebrated work, *Adekan* (アデカン). Serialized since 2008 in Shinshokan's *Wings* magazine, the series is distinguished by its sumptuous and richly detailed art style. Set in an alternate version of the Meiji era, the story blends mystery, action, and humor, but the author's sophisticated aesthetic is its most defining characteristic. The meticulous attention to costumes, settings, and complex page composition has earned Matsumoto recognition from a niche audience and critics, who praise its visual uniqueness and the ability to create a fascinating and immersive narrative universe. Although he has not received any major awards, his contribution is considered significant in the realm of manga focused on aesthetics and meticulous artistic detail.