Amazon Japan has listed the 12th and final tankoubon volume of Yoshinaga Yuu’s Shujinkou Nikki (Diary of a Female Lead: Shujinkou Nikki/ 主人恋日記 ) manga for release on January 26th, 2026. The 12th volume is described as a special edition which includes three special episodes and a fan book with original manga.
Author Yoshinaga started the story in August 2021 on Shogakukan’s Betsucomi magazine, and Shogakukan published the manga’s first volume in December 2021 and the 11th volume in June 2025. The manga concluded its original run in May 2025; however, it was later confirmed that the manga would return in August 2025 for a special episode.
Seven Seas Entertainment publishes the manga in English under the title Diary of a Female Lead: Shujinkou Nikki, and it will release the fifth volume on January 13th, 2026 and the sixth volume on April 14th, 2026. Seven Seas Entertainment describes the manga story below:
“Tsujimura Aoi wouldn’t consider herself a main character by any means. Meek and insecure, she’s constantly alone, unlike her athletic older brother, Itsuki, or her mother, a famous shojo mangaka. Aoi doesn’t need to be the heroine, though—all she wants is a true friend. But Itsuki disagrees, and when he brings home Aoi’s effortlessly cool classmate Mizusawa Sena, the two concoct a plan to teach Aoi all about love, using shojo manga as their guide. Can this drab side character become an unparalleled female lead by falling for the perfect guy?”
