A young schoolgirl named Nana lives alone while her parents work long hours. Her neighbor Tomoka, a married woman, can't resist Nana's innocent charm and irresistible allure. She starts spending time with Nana under the guise of helping her study. Unbeknownst to them both, Tomoka secretly adds aphrodisiac to a drink she gives Nana. As soon as Nana takes a sip, she becomes aroused and falls deeply asleep. When she wakes up feeling strange, Tomoka sends her home but Nana can't forget the pleasure she experienced. Later that day, driven by insatiable lust, Nana returns to Tomoka's house where they continue their intimate encounter. This time around, the powerful aphrodisiac makes Nana extremely sensitive, leaving her unable to resist Tomoka's advances. As they become more passionate, Nana experiences her first orgasm while her bare pussy glistens with excitement...