In the end of WWII world, the demons in Japan are forced to make a decision in regards to the changes Japan is undergoing:
1) To remain as demons and watch over the land
2) To return to the netherworld or
3) To give up their power and status as demons and live amongst humans.
While there were some that chose otherwise, the majority of the demons decided it was best for everyone to go with option 3. It was tough, but as time passed these demons were able to blend in with the human world and live peacefully amongst them.
However, blood is thicker than water. The offsprings of these demons displayed powerful abilities superior than man and was labeled by society as Jinyous. Of these Jinyous, most were sent to Kamizawa City: an isolated city to keep all the Jinyous together. Moreover, the ones that were deemed dangerous were sent to an uncharted island.
Takabe Ryouichi was one that was sent to said island at the age of 5. This is a story about him along with Suzu, his only friend on the island, escaping to Kamizawa city to live a normal life. What they didn’t expect, was that Suzu carried a secret that attracted much unwanted attention…