Namjoo moves into a new home, only to discover that his next-door neighbor, Juhee, is no ordinary woman. Like a real-life gacha game, her face and body transform at random! And the only way to revert to her original form? Multiple orgasms. When Namjoo accidentally stumbles upon her secret, Juhee strikes a deal—they'll be fuck buddies. They say a man’s ideal type is a woman he’s never seen before... but what if she changes every time? A thrilling, unpredictable romance begins with the ever-changing "Gacha Girl" next door!