Brought to you by the ultra-erotic production team T-REX, this is the anime adaptation of a consensual adult PC game by DWARFSOFT—a studio renowned for its fetish-filled erotic titles!
One day, the protagonist, Keisuke Tsukikawa, loses the necklace he has worn since childhood. That night, while paralyzed by sleep paralysis, Keisuke is assaulted by his younger sister, Saki Tsukikawa, who is dressed as a devil. When he confides in Riri Manabe—a fellow member of his school club—he learns the shocking truth: Saki, his non-blood-related sister, is actually a succubus. With the protective charm's power gone, Keisuke begins to discover the lewd true natures of his classmate Riri and his stepsister Saki...
*The ☆ in the title represents a heart symbol.
