Juukai" are monsters that are the result of human obsessions and grudges.
Miu, an exorcist who exorcises them, spends his days fighting alongside Shikami, who is also a "Juukai" but is on Miu's side.
The two of them have a secret that they can't tell anyone about.

Their relationship of master and servant is reversed during the day and at night .

After Shikami accidentally finds out that Miu is a masochist, Miu proposes that they become SM partners.
Blindfolded, restrained, and tormenting her uterus. Although they play violently, Shikami never does anything that Miu really dislikes. Miu is
gradually drawn to his kindness, but...

"The target of this extermination is Shikami, your partner."

With this merciless extermination order that Miu cannot disobey, their relationship gradually becomes strained...?

"I'll make you remember who Miu belongs to."
"It's different from now on. I'm going to seriously violate you."

The serious training of Shikami, driven mad by obsession and jealousy, begins.