According to an ancient legend, there is a plaque engraved with the words of the divine vow, which is the key to the mysteries of the universe. Only those who have inherited the light and shadow can be admitted to these secrets.

Kaori is a modest girl who is secretly in love with her senpai. One day, she finds out about an ad for mysterious dreams, where people can relive real dreams, and decides to give it a try. After registering, she finds herself in a mysterious place where she is forced to undress and put on a special sensory suit with devices attached to her body.

A group of six girls goes on a summer vacation to the sea. But their journey turns into a nightmare that they won't be able to forget.

The head of the "organization" nicknamed Santa does not look like a "knight without fear and reproach". He can be described as a greedy, lazy and amorous man who spares no effort or expense to win the attention of beautiful women, even though this often leads to unpleasant consequences for him.