Desperate to shed his virginity and die instantly, Takeshi sketches a demonic ring in the dim corner of his room, hoping to summon a succubus who will drain him. He succeeds, calling forth Miyu, yet she too is a virgin—utterly inexperienced in her singular role. Though Miyu strives to satisfy Takeshi to the point of death, she falls short; perhaps their shared naivety will guide them toward their true fates.
Meanwhile, Shuu has just moved into a new flat and spots a blonde doll perched above his wardrobe. Choosing to care for it out of fear that discarding it would bring a curse, he is suddenly blessed with good fortune. The doll eventually transforms into a woman named Nina. To his astonishment, she immediately sets out to quell Shuu's sexual urges, easing his longing and bringing unexpected relief. The newfound companionship also lifts his spirits, turning the apartment into a place of calm and strange wonder.
