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...

It's been 20 years since a meteorite known as "Black Night Siderite" landed on Earth and the world fended off an attack from the beings now manifested known as "D2s". Music has been banned since then as it seems to attract them. One day while the talented pianist Takt finally decided to leave the gloom of his garage to perform publicly...