Best Mystery Anime of 2000

In the past, a student managed to successfully drive away all the ghosts from a school that was rumored to be haunted. Now, those spirits have returned, seeking vengeance. Satsuki and Keiichirou Miyanoshita, a pair of siblings, are still grieving the death of their mother. When they move to her old hometown, they find that their new school is an aging building filled with whispers of paranormal activity. At first, they dismiss these stories, but they soon realize the ghosts are real and hold a particular grudge against them. The series Gakkou no Kaidan follows the terrifying ordeals of the siblings and their new friends as they struggle to survive the anger of the school's vengeful spirits, with help from their pet cat.

Boogiepop is a legendary shinigami said to exist unseen. Five years ago, a series of brutal murders caused widespread fear, with some students blaming those deaths on this supposed god of death. Now, as strange events again disturb the students at Hijiridani High School and Shinyo Academy, rumors of the mysterious Boogiepop come back. These stories being spread may hold fragments of truth or point to a reality far darker than people understand.

On a stormy afternoon, the Detective Boys witness a murder occurring across the street, but they are trapped by traffic as the culprit flees, leaving Conan Edogawa with only a partial clue from a mortally wounded detective. Several days later, another detective is found dead in a parking lot, causing panic within the police force. Suspicion grows that one of their own may be the perpetrator, and officers without alibis face intense scrutiny. Despite increased caution, the killer strikes again, this time nearly capturing Ran Mouri. Ran awakens in the hospital with retrograde amnesia, unable to recall her past. After her release, she struggles with the fear that she may not recover her memories before the killer targets her again based on what she might have seen. Although she is protected by friends and family, it falls to Conan to solve the mystery and expose the murderer's true identity before another attack occurs.

Even after death, life is still filled with paperwork and criminals. Tsuzuki Asato is a cheerful, somewhat goofy 26-year-old shinigami tasked with ensuring the dead stay dead and remain in their proper realms. Despite holding this job for over 70 years, he works in the worst division with meager pay. He also has a habit of driving away partners—shinigami are required to work in pairs—but he may finally have found one who sticks: the stubborn, sharp-tongued, serious, and defensive 16-year-old Kurosaki Hisoka. As they investigate each case, they draw closer to uncovering the conspiracies surrounding serial killer Dr. Muraki Kazutaka. Tsuzuki's bond with Hisoka grows stronger and more intimate, yet a dark secret about how Tsuzuki died continues to haunt him, refusing to let him find peace.

Mitsuhiko Tsuburaya gives Conan Edogawa a large stack of manga, which Conan starts reading. Meanwhile, the Mine family requests Kogorou Mouri's help in protecting a valuable sword inside their dojo after receiving a threat from Kaitou Kid. When Conan arrives at the dojo with his friends, he meets Yaiba Kurogane. The two join forces to stop Kaitou Kid's theft, though Conan gradually senses that there is more to the case than initially meets the eye.

Taichi Keaton lives many lives at once: a father, a historian, a traveler across the globe, a negotiator, an archaeologist, a former survival instructor, and an insurance investigator for Lloyd's of London. His methods may appear unconventional, but he always manages to complete his assignments, frequently gaining or passing along meaningful lessons along the way. On his journeys, some regard him as a fraud, yet those who truly understand him see him as a master of life itself.

At a New York auction, Lupin lifts a ring, with Zenigata in close pursuit—alongside a gun-toting former-KGB thug named Nabikov. Nabikov answers to Cynthia, the woman in charge of the BOW: Bank of the World. Cynthia knows the ring is actually a key that leads to a remarkable brooch once worn by conquerors of old. The brooch is rumored to have granted them extraordinary abilities, elevating them beyond ordinary men and women and enabling them to leave their stamp on history. Can Lupin and his crew secure the brooch before Cynthia uses it to carve out her own mark through bloody, international war?

This second installment, The Second Guest, also comprises 25 tales, though this time the primary victim is a woman who has just taken a taxi home from her best friend's wedding ceremony.

The third series, The Last Train is set with 26 stories during a bizarre train ride that Gregory embarks upon.

On New Year's Eve of the year 2000, the ageless Tezuka Osamu gathers his characters at Dr. Tenma's residence to celebrate. However, just as the party is about to start, he disappears from his room in what seems to be a kidnapping. This classic mystery narrative acts as a heartwarming tribute to the mastermind behind these creations.

The insect world brims with wonder and fascination. This animated series draws inspiration from "The Diary of Insects" by Jean Henri Fabre, a renowned 19th-century French entomologist and author. In Fabre's original works, the lives of insects are vividly portrayed. Here, all insects and bugs have been given human traits and transformed into charming animated characters. This tale follows the thrilling escapades of a crime-fighter within the insect realm! The protagonist's investigative methods are remarkably distinctive, consistently resulting in unexpected resolutions. As the cool-headed Inspector Fabre untangles the threads of mysteries and conspiracies in a style reminiscent of Sherlock Holmes, the fascinating biology of various insects is revealed step by step.