Lily was raised in misery after her twin sister decided her fate, telling her, “You are the villainess.” Abused and treated poorly, Lily is eventually abandoned in the forest and prepares herself for death. However, she is saved by a fluffy beastman and taken in by his family. Their family rule is simple: “There’s only one rule — spoil the youngest child as much as possible!” Instead of suffering, Lily begins a warm and gentle life as the beloved little sister of this fluffy beastman family, who dote on her and protect her excessively. One day, it is revealed that Lily has received a blessing from the gods, and within her resides an extraordinary and unmatched “power of a Saint."