It turns out that she and another man named, Enigma, want to fulfill Jin's wish which is to destroy all puzzles. However, he and his friends encountered a mysterious girl named Raetsel, who happens to be someone that Jin knew in the past. In season three, Kaito attempts to restore the memories of his mentor, Jin, after the events from season one. The Orpheus Order ups the ante with manmade Death Trap puzzles and display that they are more than willing to pull innocent bystanders into the fray if it means furthering their goals. In season two, Kaito and friends are finally able to enjoy a period of normalcy, but this peace is soon shattered by the appearance of the Orpheus Order- Kaito and friends' actions in the previous season have earned their everlasting enmity. Not only that, but there is a mysterious organization known as POG that's activating these puzzles and are specifically targeting Kaito in order to force him to solve them.

These are the 'Philosopher's Puzzles': dangerous puzzles that, if left unsolved, will cause some sort of disaster. Taking this as a challenge, he and his friend, Nonoha, decide to follow their directions, only to be forced to solve puzzles that have a dangerous touch of Death Trap to them.

He gets a strange device that sends him puzzles and, on occasion, directions to a certain location. Kaito, a puzzle-loving high school freshman, is drawn into the strange world of 'Phi Brain'. It's directed by Junichi Sato, written by 'Hajime Yatate' and while it has average animation quality (greatly improved in the second season), the series employs an all-star voice cast. Produced by Sunrise, it premiered on October 2, 2011. An anime that appeared as part of NHK's Fall 2011 lineup.

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