Come Come Vanilla!

Kaji Rikuo, a regular high school boy, has his life turned upside down by the arrival of Vanilla, a cute girl with cat ears. Created by her master, Ibu Kiriko, through a combination of different animal mixtures, Vanilla is a chimera-like being. With Kiriko seeking revenge against Rikuo, Vanilla is sent to disrupt his life, but her clueless and affectionate nature leads to an unexpected friendship between her and Rikuo. However, their bond is complicated by the fact that Vanilla can transform into a vicious animal at Kiriko's command, putting Rikuo in harm's way and raising questions about the motives behind Kiriko's vendetta against him.