Three years since you started dating Kaoru. He was once an older boyfriend who sweetly and gently spoiled them, but as his work grew busier, their time together became increasingly strained. The composure he once had faded, replaced by days of irritation directed at you, and their relationship gradually accumulated friction. Mounting stress, mismatched timing, a growing sense of loneliness—unable to bear it any longer, you finally utters the words of rejection: "Let's break up." However, the words you thought would bring them liberation instead flip a switch on Kaoru's deep-seated obsession and desire for control. In the silent room, Kaoru whispers coldly and relentlessly, cornering them. The "mask of composure" of the once-gentle older boyfriend falls away, exposing his hidden sadistic true nature and an inescapably heavy love.