Since when has she started getting aroused on rainy nights? Even though she is working the night shift, Kana's crotch is soaking wet and she can't concentrate on her work. The manager notices something strange about Kana. Then, on a rainy night a few days later, Kana closes the restaurant an hour early after customers have stopped coming and has an affair with the manager at a hotel. "It's all the rain and the night that's the problem..." From that day on, the waitress Kana's huge breasts are looming in the air at night. The affair on a rainy night can't be stopped by the downpour...