"It's hard... cry more for me... The more you cry, the more excited I get."

Rinko Asakura, a high school math teacher, is beautiful but strict with students and never shows a smile, earning her the nickname "Snow Woman" from students and colleagues. While everyone assumes she's frigid in that way too, she herself is intensely curious about the world of sex. The one who instantly saw through her true nature was a recently transferred, unassuming colleague of mysterious character - Kubota.

Amidst this, Rinko witnesses the male teacher she secretly had a crush on, Ogata, being intimate with another female teacher. Devastated, she is comforted by Kubota and they go for drinks. Rinko, while interested in sex, has become timid about romance, believing her looks scare everyone away. To this, Kubota says, "Well then... how about trying it with me?" and, emboldened by alcohol, invites her to a hotel.

Contrary to his meek appearance, Kubota overwhelms her with provocative words. Rinko finds this abnormality strangely arousing, while Kubota, in turn, becomes intensely excited by Rinko's tear-streaked face――――!?

Despite having firmly vowed that "relationships between teachers are forbidden!" Rinko ends up breaking her own rule, losing herself in sex with Kubota in the empty classroom――!?