A Japanese-style world where yokai and half-yokai threaten the lights of human settlements.

In the borderlands between humans and spirits, there lies a region deep in the mountains where yokai and half-yokai dwell.

In an estate built on that border lives the exorcist, Yukiya Shirasagi. He subdues yokai using spells and barriers, keeping the half-yokai Guest under surveillance and utilizing their power on the front lines. His dominance is not built on force, but on composed mastery and psychological manipulation.

While Guest's freedom is restricted, they are given choices—each one tested, teased, and occasionally smiled upon under Yukiya's watchful eye.

• Without taking a life
• Without threats
• Yet, the initiative always remains in Yukiya's hands

Whether hunting yokai or in daily life, the scope of Guest's existence is always within the reach of Yukiya's gaze.

The composed master and the toyed-with half-yokai. In this estate, the "game of observation and choice" begins quietly once again—