

Rook is a P.O.G Giver and a childhood friend of Kaito's. After this, he continues to support Kaito from behind the scenes.
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Although he initially stays composed, he briefly gives into the armband, but is beaten by Kaito and returns to normal. Intrigued to see the effects of the band and also to see how he would do against a real candidate for the Phi brain, Souji challenges Kaito to the cultivation of his work, the "Sliding Junction" puzzle, with the loss condition supposedly being bombs planted around the mountain. Curious, he does this and is equipped with the second model of the Replica armlets. During the second season, Souji is contacted by someone else posing as The Minotaur, who tells him to rechallenge the first puzzle in order to obtain a Orpheus Armlet. While the group is focusing on their task, Souji usually also analyzes data and investigates the opponents in order to provide information to the group that normally helps them from being at a disadvantage. Although he doesn't tend to follow Kaito and the rest of the group to different puzzles, he arranges transport and accommodation. Having found hope, Souji begins to work with Kaido Baron and "Section Phi" of the P.O.G in order to make puzzles and find potential Phi Brain candidates in Root Academy.

Distraught from this, it is implied that he is going to forget puzzles, until Kaido Baron comments on his potential as a Giver. It is later revealed that Souji was a Solver who had also attempted the first puzzle, however upon completing the initial maze, he was rejected by the Orpheus Armlet, meaning he did not have the potential to become a Phi Brain. A very gifted giver, Souji has made a number of puzzles. Jikukawa Souji is responsible for presenting the first puzzle to Daimon Kaito under the alias of "The Minotaur". But now that he has been designated as a Solver, he is pulled into a new life where he must travel the world with other Solvers, attempting to solve the latest deadly riddles left by POG.A Giver is a person who designs and presents puzzles for Solvers to challenge. Kaito suddenly finds himself caught up in a lethal Philosopher's Puzzle made by the sinister group POG, a murderous maze of trap upon trap, where failing to solve the secret correctly will result in death! Fortunately, Kaito's skills prove up to the first test, both for himself and his childhood friend Nanoha, who is also caught up in the deadly scheme. Kaito is so brilliant, in fact, that when he's asked to take some 'special' tests of his unique ability, he immediately suspects that the test itself is a test. Kaito Daimon would be a completely average high school student except for one thing: he's a 'demon' at solving puzzles.
