Saint knight Serushia and friends challenged the subjugation of demon king. And though elder brother Senia of Serushia is sacrificed for sealing Devil King after the fierce battle peace visited this world. However it is a moment to have felt peaceful, the messenger of urgency comes unexpectedly in Serushia. Rescue request from town alto of the vicinity to which it walked on road of revival. The town, it was being attacked by the band of thieves that orc's chief called Oruoga led. Serushia and warrior Aisshu, Priest Fuiorn, tens of knight members are taken along and it faces alto, demon Family that attacks it splendidly is avenged and Oruoga is repulsed.

The resident in the town greets the knight squad with voice of rejoicing, the feast was held as a small entertainment. And while the feast has risen to the climax, a shrill scream sounds in the town of alto. The one that Serushia who had run to the scene saw, abnormal scene that knight member is attacking city girl. Eyes are bloodshot as the member was out of one's sense, with the voice which goes mad who cannot the desire raised, what is human?, the appearance is made to be transfigured to the existence of grotesque. It appears there suddenly, girl Rukiyusu of Demon Family. The identity very much, it was a daughter of Devil King. Stretch around the magical barrier of the human body change in whole town about Rukiyusu, human was gradually made to be transfigured to Demon Family. To Serushia who cannot find the breakthrough plan, one proposal of Rukiyusu. If it follows the instruction of Rukiyusu, the one of weakening the power of the magical barrier. Without forgetting the pride as a saint knight, serushia throws away arms, the demand of Rukiyusu is accepted. Thus the shrewd trick of the name called revenge by Devil King's daughter Rukiyusu starts...