Taishu Kase

For 60 years, the group of detectives known as "Detective Office 5" has raised the bar for detective work. The agents of Detective Office 5 are a group of stellar detectives lead by the genius code breaker Detective 507. When an unknown client enlists 507 to crack his most difficult programming code yet, the detective embarks for Shanghai where he crosses paths with a sniper, an informant, the head of the Blue-Dragon Mafia, and beautiful singer on the run, Meilan. As 507 stumbles deeper into a twisted quagmire of intrigue he discovers the sad truth behind the mystery.

When the mobster Iwaida Nishikawi is executed by the hit man Takeshi, his family chases the killer. Takeshi's brothers Takashi and Hideshi Miwa try to find Takeshi, who is hidden with the nurse Rie Ishibashi, to protect him and Hideshi discovers that Takeshi was secretly sent by their Yakuza boss to eliminate Iwaida. Meanwhile, the mobster Kenmoshi abducts Takashi's wife Mariko and rapes her, trying to force Takashi to deliver his brother to him.

"Bankruptcy fighter" Akiko Tachibana is back, this time defending a friend's business from shady loan sharks.

When Aoi is gang-raped by her classmates and kicked out of her home by her own parents she sees no reason to continue living. Before she commits suicide, however, she receives an email on her cellphone from a man named Toshi addressed to a girl named Ai. The message simply thanks the girl for being alive, but this specific message has an effect on Aoi and she decides to keep on living. Without many options, Aoi resorts to everything from paid dating to porn to earn money and meets a lot of less than reputable characters. Throughout it all though she looks toward Toshi as her hope for happiness and the two form a relationship.

A man is assaulted by someone with a bat and attempts to figure out why.

Approached by a friend about a matchmaking arrangement, Su-san goes to Hama-chan's home seeking help. Hama-chan is away on a business trip, but Michiko entertains Su-san late into the night. When he gets drunk and ends up spending the night, Hama-chan, begins to question his boss's relationship with Michiko.