Oujisama ni wa Doku ga Aru.

Rizu's childhood friend Souta has always been super cute but also just a little helpless, so she's taken it upon herself to take care of him. Little does she know, that Souta is only a facade! No scheme is too extravagant—Souta will stop at nothing to keep her to himself.

(Source: Kodansha Comics USA)

Included one-shot:
Volume 1: Ayukawa Rena wa Shigo 4-ka (It's Been 4 Days After Rena Ayukawa's Death)

Oujisama ni wa Doku ga Aru. was published digitally in English as The Prince's Black Poison by Kodansha Comics USA from December 19, 2017 to October 29, 2019.