Programmer Finn Forrest enters the World of Rules and Horror on a terrifying flight, where phantom flight attendants kill mercilessly. Finn Forrest is bound to the Prolific Progeny System. Its goal: win over S-class Phantom Chief Purser, Serena, and get her pregnant. Finn Forrest desperately raises her affection level. Finn relies on the phantom's protection. He uses the 'One-Shot Conception' skill to complete the mission, win the beauty and a villa.