Come Come Vanilla!

A high school student named Kaji Rikuo is unexpectedly approached by a girl named Vanilla, who has cat ears. Vanilla explains that she is a chimera-like being made from various animals by her creator, Ibu Kiriko, who seeks revenge against Rikuo. Puzzled by this, Rikuo begins to spend time with Vanilla, who is both innocent and unaware of the danger she poses. When given orders by Kiriko, Vanilla can transform into a dangerous creature capable of harming Rikuo.