(from ebookjapan):
Hitori, who is in love with Hatano Sanshiro, a deputy in the magistrate's office, spends her time taking care of Hatano's personal needs while living with her father-in-law, Okkibiki Sanshi. However, when a difficult case arises, Hitori uses her kunoichi skills to solve it. Neither Sanji nor Hatano are happy about this, but the case involves the Manji party, a group of ninja that Hitori once belonged to, and Hitori herself is sometimes targeted. ...... Hitori, a former kunoichi, solves the cases that occur in Edo, in this erotic detective story!