Demon summoner - what is this? And why?... These are the main questions Touya Douji is trying to answer. Just where should he be looking for them? Maybe, inside himself?

As a baby Jiro was delivered to his foster parents by a massive oni, who said he would return for Jiro in 15 years. When the time comes Jiro must contend with enemy oni, dark cultists, and their minions while...

Shou, the older brother, and Saya, the little sister, only have each other. The two of them lived happily, enjoying their peaceful lives together. That is, until Saya was bitten. When bitten by a pure-blooded...