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During a summer vacation with record-breaking heat, Ryosuke tells his aunt Kotoha that he finally got his first girlfriend. However, Kotoha, who has been lonely and aching since her husband passed away, loses her reason when faced with his youthful innocence. Stealing away from the family's eyes, she gently seduces him, saying, "It's just sex practice." But the excuse of "instruction" gradually falls away, transforming into maddening carnal desire. On the final day, Kotoha binds Ryosuke's hands and feet, indulging in ejaculation management to squeeze every last drop from his tireless youth. During those seven immoral days, Ryosuke had no way to resist his aunt's venomous fangs...
