Matthias, a child abused continuously by his mother, having committed her murder finds refuge in a church where he meets a seemingly helpful, young priest and Hans, a fellow resident. Not much time passes, however, until Matthias realizes that there's something suspicious going on behind the facade of a peaceful shelter...
「俺と交尾してみないか？」
種族による階級社会が絶対の世界。
下層の狼族でありながら聖騎士に上り詰めたシグレは聖堂で出会った呪蛇（カタラ）のキリエを神の御使いと信じ込んでしまう。
シグレの抱いたほのかな恋心は、やがて抑えられない熱情へと変わる……。