Emi, an office worker feeling at her limit from work exhaustion, encounters Rika, a runaway girl standing alone with nowhere to go on her way back from the office. Thinking Rika was in danger when she said "I'll do anything if you let me stay," and being naturally protective, Emi decides to take her in out of concern. However, upon bringing her home, Rika accidentally discovers that Emi is a lesbian... "You can do whatever you want with my body as thanks for letting me stay." Facing Rika's sweet temptation, Emi, though knowing it's wrong, gradually loses her reason and ends up passionately desiring her beautiful body...