"Minimum" - a special inborn power found in a limited number of human beings, known as "minimum holders." In Yokohama, the detective team Hamatora, formed by two minimum holders named Nice and Murasaki, comes across information connected to a serial killer being pursued by their old friend Art. It turns out all the victims are minimum holders like them. Unwillingly at first, the two detectives become involved in the investigation.
Misaki Ayuzawa is the first female student council president at a once all-boys school turned co-ed. She rules the school with strict discipline demeanor. But she has a secret—she works at a maid cafe due to her families circumstances. One day the popular A-student and notorious heart breaker Takumi Usui finds out her secret and makes a deal with her to keep it hush from the school in exchange for spending some time with him.
In another dimension the Devil King Sadao is only one step away from conquering the world when he is beaten by Hero Emilia and forced to drift to the other world: modern-day Tokyo. As "conquering the world" are the only skills the Devil King possesses - and are obviously unnecessary in his new situation - he must work as a freeter to pay for his living expenses.