Yasuko, a housewife, lives in an urban high-rise apartment with her husband Satoru and her son Takuto. Annoyed by spam calls and door-to-door salesmen, Yasuko slams the door on a salesman’s hand when he tries to squeeze a flyer through the apartment's chained front door. He leaves, but the next day, her nightmare starts.

Hyoi and Rui, two inhuman brothers with the powers of the Dark Cat, a spiritual martial art that allows them to sense supernatural beings and turn into cats, are caught up in a dilemma involving their Dark Cat master, Jakokubo, who plans to summon the evil in humans as a tremendous feast for himself and his power. What do a group of local high schoolers have to do with his nefarious plans, and will the Dark Cat brothers be able to save their newfound friends from certain danger?

Born as an aberration different from the expectations of a chief's son, Fei Long has been ostracized by his own people. To prepare for his destined future role as chief of his clan, Fei Long is sent to Japan to complete his schooling and gain experience mingling with humans. In Japan, he discovers not everything is simple.

Teenager Kanemori Kousuke is a secret agent for the international VN spy network. Using his computer hacking skills, he tracks international criminals. Later he goes after Neo-Nazis to the Arctic were they try to raise a U-boat with a sinister secret.