Lumier, who possesses mysterious powers and never ages, lives quietly in the forest, away from others.
Roy was picked up by Lumier in the forest as a child.
He swore to serve Lumier for the rest of his life, but before he knew it, he had feelings for her that were too strong. Roy had planned to keep his
feelings hidden and live a peaceful life with Lumier, but
one day, Lumier told him something unexpected, and his feelings ran wild.

It starts with misunderstandings and forcing, but ends with mutual love and sex, a happy ending.