Oyamada Shogou was one of the Otherworld Heroes of the 2C Class summoned by the Goddess Vysis. He was one of the members of the Kirihara Group and the best friend of the leader, being second in command. Back on Earth, he was one of the key figures of the class and a notorious bully.

Unlike his friend Kirihara, Oyamada was a narcissistic bully who took pleasure in looking down on others. He particularly enjoyed picking on the weak, and he would confront anyone who dared to challenge him. Also, he was quite arrogant, which was made much more obvious when it was discovered that he was an A-rank.