On a rainy afternoon, the Detective Boys witness a murder across the street. Barred by traffic, the culprit slips away and Conan Edogawa is left a single clue by a dying detective. Days later, another detective is found murdered in a parking lot, leaving the police rattled. Suspicious that the culprit is one of their own, everyone in the police department without an alibi is suspect. But despite being on high alert, they are outmaneuvered and suffer yet another attack—this time with Ran Mouri finding herself in the crossfire. Traumatized, Ran wakes in the hospital with retrograde amnesia, remembering nothing about her life. Soon released, she struggles to remember her past and grows fearful of not regaining her memories before being targeted by the killer for what she witnessed. As she is guarded by friends and family, it is up to Conan to piece together the clues and find who the murderer is before they strike again. [Written by MAL Rewrite]

Aya, Youji, Ken, and Omi are the four young men who comprise Weiss Kreuz (WK), an assassin group that eliminates certain menaces to society. Each member has his own trademark fighting style. Aya is adept at fighting with a katana, Youji has mastered the art of strangulation via strings, Ken is lethal with his metal claws, while Omi specializes in a wide array of projectiles. Under the command of a mysterious man known only as “Persia”, the WK is dispatched to take care of drug rings, terrorist factions, and the like. But as things go along, they discover that most, if not all, the bad elements they have dealt with are somehow connected to the Takatori family. The Takatori family is rich, powerful, and influential. It seems if the problem is to be nipped in the bud, the WK would have to put an end to one of Japan’s most prominent clans. (Source: AniDB)