Shiki quickly got along well with her mother's new husband, forming a warm and joyful family. One day, her mother went on a trip, leaving only her stepfather and Shiki for three days. However, one night, her stepfather suddenly said, "I've been dreaming of making love with you for two years," and then he went berserk on Shiki, secretly drugging her with an aphrodisiac to make her aroused. He then took advantage of her, constantly putting pressure on her body from morning till night, causing her to ejaculate repeatedly and become extremely sexually aroused, arriving even earlier than her mother. Shiki was reduced to a pitiful sex slave.