The male protagonist is at the beginning of the story a young boy living in a deep forest protected by his older half-brother.Cursed to die if he doesnt get nourishment from his monster mother the knowledge that she hates him is a constant pain in his already unnatural and harsh life.

Things change one day when he meets a cheerful and mysterious young girl...

Both the prequel and sequel of "Ao no Haha". It tells the past events that lead up to the main series and concludes in the present.

The "Japanese-style fantasy" series centers on two mountain demon brothers who have different mothers, and are persecuted by other mountain demons. [ANN]