Haibaiyōshi Mizuiro

Haibaiyōshi Mizuiro (胚培養士ミズイロ) is a Japanese manga series written and illustrated by Mari Okazaki. It has been serialized in Shogakukan's manga magazine Weekly Big Comic Spirits since October 2022.

Publication
Written and illustrated by Mari Okazaki, Haibaiyōshi Mizuiro started in Shogakukan's manga magazine Weekly Big Comic Spirits on October 3, 2022. Shogakukan has collected its chapters into individual volumes. The first volume was released on January 30, 2023. As of May 30, 2024, five volumes have been released.

Reception
The manga was ranked second for the second Crea Nighttime Manga Award in 2023. Along with Watashitachi wa Mutsū Renai ga Shitai, Haibaiyōshi Mizuiro ranked 30th on the 2023 "Book of the Year" list by Da Vinci magazine. The series ranked seventh on Takarajimasha's Kono Manga ga Sugoi! list of best manga of 2024 for male readers.