It is the Tenpo Era, 1830. Jinta runs away from home with his half-demon younger sister Suzune who was being abused by their father. Not long later, the pair are taken in by Motoharu, a guardian from the nearby village of Kodano. When their Miko "Itsuyuki" servant of the Fire God is slain by a demon, Jinta decides to take up the role of...

A neatly dressed, polite and optimistic young "Girl with Black Hair" is out drinking at a party but soon finds herself going on an adventure in Pontocho as she moves from place to place during the after party, meeting various people from all walks of life. Meanwhile, her "Senpai (Senior)" who always had a crush on her tries to win her...