In a desperate attempt to lose his virginity and die immediately afterward, Takeshi draws a demonic circle, hoping to summon a succubus to drain him completely. He successfully summons one named Miyu, but she is also a virgin—entirely inexperienced in her sole purpose. Although Miyu's earnest efforts to please Takeshi to the point of death are not fully effective, perhaps the bond between these two virgins will help them fulfill their true destinies. Meanwhile, a man named Shuu has recently moved into a new apartment, where he notices a blonde doll perched above his closet. Deciding to keep it out of fear that disposing of it would bring a curse upon him, he finds himself overflowing with good luck. Eventually, the doll takes on a human form and introduces herself as Nina. As if things could not improve further, she promptly sets about satisfying Shuu's sexual desires.