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Souma (ソーマ, Sōma) and Mitsuhiro Kunieda (国枝 光博, Kunieda Mitsuhiro) are a major mamodo and human team that only appears in Zatch Bell video game Makai no Bookmark. Their role on it is unknown, but however, their spells are based on Bones. As they're part of the actual mamodo battle, they fight Zatch, Kanchomé, Tia and Ponygon.
Before the start of the game, Souma and Mitsuhiro had battled against Biburio, but after he attacked with the Barudesu, Biburio gained a new spell Rigaro Animuku, that "transformed" they in manga books. After that he have "turn into" Kokomelo.
He appeared as Kokomelo (ココメロ) in the first part of the game to ask Zatch for help in the mission of destroy the mamodos revived by the Animuto of Biburio.
Levels after it when Zatch and Tia go to a library, they had a conversation, after it they find Biburio and he used Birude Animuga, then soma in Kokomelo's form appeared and burned Biburio's book,and turn back to own form and show that he can use other mamodos spells.
After that Souma disappeared, then the Zatch and Tia go to search him, later they find, then he to destroy used Gigano Doruk, but Zatch and Tia defeated him, and he turned back to original form, but he lost the capacity of use other mamodos spells, then Kunimitsu appeared and they fight versus Zatch and Tia, lately he had the book burned.