(from ebookjapan):
The setting is Edo. A woman and a child are found stabbed to death on a beach. The woman-loving Kuzaburo and his underboss Kensaku go after the underboss, but...? Yamada Kuzaburo who cheers up when the bell rings at twilight, is an easygoing Doshin called the Twilight Doshin, and is going to defeat the evils of Edo!