November, Winter.

In a certain mountainous region, a Mission-type All Girls School "Kirihara Gakuen", where males are prohibited to enter, is located . The protagonist, Father Shiratori Ritsu, is an exemption to this.

Ritsu has the power to make people who, when touched, especially those who experience it during sexual intercourse, "Happy".

Born with this power, he is targeted by devils and has never left the church ever since he was little.

Embraced by the girls of the school while being named as an "Angel", Ritsu took the sin of killing one girl and made a pledge to make others happy more than anything.

The daily life that kept sanity on the edge while going back and forth between purity and immorality. However, by the appearance of one girl, the story's curtain rises.

A vampire who has traveled a 100 years, "Mary Harker". And, creeping into the school alongside her, was the voice of the devil that whispered from the phone. Does the power of "miracle" really make people happy? The worth of being born in this world?

That is, by the bindings of prayer, the Story of Life -