Tokko (2006)

Kindaichi Hajime may look dumb, but he is one of the smartest you will ever see. He encounters mysteries after mysteries with his good friend, Miyuki, and he swears to solve them in the name of his grandfather, which was a great detective.

The anime follows a salaryman who has a chance meeting with a girl named Ai on the train. They begin to meet every Monday on the train, with the man serving as her bodyguard on the crowded commute while they chat.

The story starts off with a face-off between two rival heroes, ZET and ALPHAS, and then traces their origins - Jin Kanzaki, a young man with the ability to transform into a superhuman being known as ZET, and Kouga Amagi, a young man with a strong sense of justice who uses technology to fight as ALPHAS. The fates of these two men and those around them intertwine as they fight to protect mankind and destroy monstrous abominations known as Players.

Stalked by a beastly white tiger, Atsushi Nakajima has no idea that the menace lives inside him—a power that catches the attention of the Armed Detective Agency. Using inhuman abilities to combat crime, this team takes Atsushi under the wing of their most eccentric member, Dazai. Together, they tear through mafia-muddled mysteries while enemies keep an eye on the tiger’s lofty bounty.

Godai is a ronin (someone who has failed university entrance exams) living in a run down apartment house called Maison Ikkoku. Among the other residents are the nosy Ichinose, the sexy Akemi Roppongi, and the mysterious Yotsuya. The others are given to having wild parties which makes it difficult for Godai to study. Into this mayhem comes the recently widowed Kyoko as the new live-in manager. Godai falls for her, but doesn't have the nerve to tell her. As time passes, their relationship slowly develops amid life at Maison Ikkoku, despite all sorts of romantic hurdles.

Ryo Saeba works the streets of Tokyo as the City Hunter. He's a "sweeper" and with his sidekick Kaori Makimura, he keeps the city clean. People hire the City Hunter to solve their dangerous problems, which he does with a Colt Python. When Ryo's not working on a case, he's working on getting the ladies, and Kaori must keep him in check with her trusty 10 kg hammer.

Many years ago, a Great Civil War ravaged Japan, leaving the country fragmented between two regions: Kansai and Kanto. In Kansai, a group of six Akudama carry out missions given to them by a mysterious black cat, while evading the police. But a dangerous journey is about to unfold when a civilian girl becomes twisted into the Akudama's way of life and witnesses their criminal drives.

In the year 2113, people are given brain scans to determine how likely they are to commit a crime. Those who fail are apprehended, or even killed.

The beautiful and successful supermodel Jun Fudou meets a woman named Lan Asuka, who confronts her with a werewolf monster, which she calls a devil beast. As a result, unimagined powers awaken in Jun, and she manages to defeat the monster. She, just like this werewolf, is part of the next step in human evolution: humans who can mutate into beast-like monsters and then mercilessly terrorise civilisation. Unlike the other devil beasts, however, she can retain her humanity, which is her undoing because Lan Asuka is a high-ranking employee of the government and of the “Anti-Beast Special Squad”, which wants to abuse her powers and train her to mercilessly hunt down her own species. Caught between these extremes and her weak self, the question arises: what fate will Jun meet? Will she ever be able to decide it for herself?

Cat's Eye is the most notorious group of art thieves in Japan. No one knows their identities, but for most of Tokyo, the mystery only heightens their allure.