Naho's a single woman in her 30's with a past. She spends her days fighting off carnal urges. One morning, Detective Tsubasa Natsunaki visits her apartment asking for information on his case. Tsubasa's a gallant, handsome, loyal young man. Naho gets it into her head that just one time would be enough, and boldly asks Tsubasa for a favor. They've spent a night of passion together, but now what...? This is the unpredictable love story between a man who's pure of heart and a slightly empty-headed woman!