The TV anime series Phi Brain is created by studio Sunrise, with an original "school adventure" story about a high school boy named Kaito who loves puzzles. One day, the president of the student council at his school gives him a mobile device, which leads him to an underground ruin near the school. Together with his girlfriend Nonoha, he tackles an "insolvable puzzle" there, which turns out to be the deadly "philosopher's puzzle" created by the dark society known as "POG". After managing to solve the puzzle and thus becoming a "Solver", he joins other Solvers in their battle with POG's puzzles all over the world. The anime is airing in Japan from October 2011.