Rikudou Riin is an undercover cop whose assignment has led him to follow a mysterious and beautiful person who goes by the name of "Joker". He soon deems that Joker isn’t really a villain - but might be a spy, a detective, a mercenary, he/she might be a man or a woman or…both!?

In the Joker Series:

1. Teiou no Niwa
2. Moon Fantasy Part 1
3. Moon Fantasy Part 2
4. Dream Playing Game
5. Green Paradise
6. Sherlockian Computer
7. X no Utagoe (Kai no Utagoe)
8. Final Misson