Formerly a graduate student majoring in psychology, he is a "genius swindler" who took down a giant MLM scam named Shuuei to avenge his mother. He helps Nao when he sees the honest nature she had, just like his mother. Although he is not invited into the Liar Game, he enters by substituting for another player in Round II. By Round III he is respected (and feared) enough by the LGT players to become unofficial leader of the Southern Country, though he tries to keep things equal in the group. Yokoya, however, knows Akiyama had been manipulating his team mates and mocks him for it.

サブ
Takayoshi Miura
ミウラタカヨシ
声優: 八代拓
Miura is a twenty-five year old man first introduced in Round II as No. 11, he tells Nao he won 2 million from Round I. Openly hostile to the LGT, he once accused them of being a scam, and later tells Nao the LGT is probably involved in human trafficking. He was one of the final contestants who was present when Fukunaga revealed his betrayal. Because he was tricked by Fukunaga, he is forced to participate in the Revival Round. When Fukunaga turns the other Revival Round participants against Nao, Miura is the only one who is nice to her. As a result, Nao chooses to save him and forces him to lose the Revival Round (although she gives him 200 million to cover his debt to the LGT).