Adapted from the video game series of the same name, NiNoKuni follows high school peers Yuu and Haru who must travel between two separate yet parallel worlds to help save their childhood friend, Kotona, whose life is in danger. In this magical quest complicated by love, the three teens will be tasked with making the ultimate choice.

In Tokyo, Japan, several grotesque murders take place on rainy days. Detective Sawamura, who is in charge of the case, soon discovers that his own family is connected to the crimes.