Ouji-sama ni wa Doku ga Aru.Ouji-sama ni wa Doku ga aru.; El Príncipe Tiene Veneno; The Prince's Black Poison; 这个王子有毒。; 王子様には毒がある。; 왕자에게는 독이있다; Ядовитый принц

Rizu has been taking care of Souta since they were young believing he is "cute Souta, who can't do anything by himself". But what happens when Rizu lessens her Motherly-like duties to pursue other activities? Cute Souta might do something about that.