The Prince's Black Poison, Volume 1 (The Prince's Black Poison #1-3)

Rizu's childhood friend Souta-kun 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-kun is only a facade! No scheme is too extravagant—Souta-kun will stop at nothing to keep her to himself. From the creator of Gakuen Prince and Rose & Wolf, Jun Yuzuki's newest work: a love story about a cute but cunning childhood friend!