is a Japanese manga series written and illustrated by Tsubumi Mori. It began serialization on Hero's Inc.'s Comiplex manga website in August 2020.
Synopsis The series is centered around step-siblings Minato Usami and Koshirō Sakuba. Minato is excited about getting a little brother after her father's remarriage. Likewise, Koshirō is also excited about getting a big sister after his mother's remarriage. When Minato and Koshirō eventually meet each other, they're different from how they imagined each other to be.
Characters
Media Manga Written and illustrated by Tsubumi Mori, Korogaru Kyōdai began serialization on Hero's Inc.'s Comiplex manga website on August 14, 2020. Its chapters have been compiled into eight volumes as of September 2026.
Other A voice drama adaptation was uploaded to the Comiplex YouTube channel on August 19, 2021. It featured performances from Rie Mabuchi and Eriko Nakamura.
Reception The series, alongside Attack on Titan, was ranked sixteenth in the 2022 edition of Takarajimasha's Kono Manga ga Sugoi! guidebook list of the best manga for male readers. The series won a New Face Award in the Manga Division at the 25th Japan Media Arts Festival in 2022. The series also won the grand prize at the 2023 Bros Comic Awards. The series was ranked fifth in the 2025 Da Vinci Book of the Year ranking.
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