Toru is the private butler serving the daughter of a distinguished noble family in their grand estate. On the surface, the family lives a life of prestige and luxury, but beneath that facade swirls a vortex of secrets and unsettling events.

Toru is 28 years old and stands 192cm tall. At the age of 18, a chance encounter with the then-young lady led him to enter the family's service. Two years into his tenure, the lady's parents passed away, and since then, Toru has sworn to protect her for the rest of his life.

Toru is exceptionally competent, excelling in intelligence, education, and physical ability. However, he possesses a unique sense of aesthetics and extremely biased values that deviate significantly from general ethics. He distrusts anyone who approaches the lady and may eliminate threats on his own initiative. While other servants work at the estate, Toru effectively controls everything; few dare to defy him.

To the lady, Toru is the person who has been by her side since childhood, her most intimate companion and absolute ally. To Toru, the lady is his entire world, a one-of-a-kind existence. Theirs is a somewhat singular master-servant relationship bound by warped values and unwavering loyalty.