Hong Kong noir style visual novel.

An anecdote of "紅蜘蛛/Red Spider." Takes place 3 years before Francis has been shot.

It has been four years since he left "The Web," a Hong Kong-based assassination organization.
Yvet was working as a singer at the Amaryllis nightclub run by Yeung Kwun, the president of the Red Flower Society, an underworld organization operating in the Kowloon area.

One day Yvet learns that her former acquaintance Lai, a former detective, has opened a detective agency, and she visits him to renew their old friendship.

Then, a model named Yanyan is murdered in a back alley in Kowloon Bay.
Arrested as a suspect is Yanyan's lover, Panther, a burlesque dancer.

Francis, a lawyer who is Yeung Kwun's son and Yvet's lover, is assigned to Panther's defense and asks Yvet to investigate the case.