One morning, a sickly young man, Kondou Tateomi, wakes up to find a strange bird-person woman next to him!? The woman, who introduces herself as Rupia, explains that Tateomi became healthy after eating an egg she laid, but the effect also made him overly aroused. Gently calming him down, Rupia welcomes him into her vagina… Please enjoy this enchanting anime of a beautiful older woman and a cute young man's lovey-dovey shonen-ai!