is a Japanese manga series written and illustrated by Natsumi Ito. It was serialized on Futabasha's manga magazine Manga Action and on the Web Comic Action website from May 2021 to October 2025.
Synopsis Set in Showa era Japan in the 1930s, the series is centered around Mitsuko Hoshino, a female detective in a time where detectives were only male. While at work, Mitsuko deals with constant sexism and calls for her to quit her job, but remains determined to carry out her work. She receives a request from a waiter named Saku Yoshida to solve the case of lost shoes at the café he works at. Saku later joins her to solve future cases.
Publication Written and illustrated by Natsumi Ito, My Dear Detective: Mitsuko's Case Files began serialization on Futabasha's manga magazine Manga Action on May 18, 2021. The series ended serialization in Manga Action on May 21, 2024, and was transferred to the Web Comic Action website resuming on October 18, 2024, and ending on October 17, 2025. Its chapters were collected in nine volumes released from October 28, 2021, to December 25, 2025.
During their panel at Anime Expo 2022, KiraKira Media announced that they added the series to their Azuki website and app. On May 15, 2024, Seven Seas Entertainment announced that they would begin to release volumes of the series in October 2024.
Reception MyAnimeList users recommended the series in 2023 for its unique story and art.
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