One day, Kokoa, who attends a cram school in Tokyo, hears a sexual word whispered in her ear by her teacher. Curious about the unfamiliar word, Kokoa looks it up in the dictionary at home, but when she learns its meaning, her pussy heats up and she stimulates her clit with her fingers. Her breasts swell with a pleasure she has never experienced before, and her vagina becomes soaked, but Kokoa, eager to learn the meaning of pleasure from her teacher, squirms and becomes excited by her first kiss and first penetration. Kokoa's delicate body jumps as he thrusts violently into the depths of her vagina, and she becomes seized by the sexual stimulation...