'Light Blue Embryologist') is a Japanese manga series written and illustrated by Mari Okazaki.

It has been serialized in Shogakukan's seinen manga magazine Weekly Big Comic Spirits since October 2022.

Written and illustrated by Mari Okazaki, Haibaiyōshi Mizuiro started in Shogakukan's seinen manga magazine Weekly Big Comic Spirits on October 3, 2022.

[9] Along with Watashitachi wa Mutsū Renai ga Shitai, Haibaiyōshi Mizuiro ranked 30th on the 2023 "Book of the Year" list by Da Vinci magazine.

[10] The series ranked seventh on Takarajimasha's Kono Manga ga Sugoi!