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