Kiruma Souichi is the current Royal Leader of Kakerou and one of the most important characters of Usogui. Souichi has the view that due to "God's will" or "destiny", he will keep on winning gambles. Though his behavior often fluctuates, and he is capricious enough to not know what to do at times, he often resorts to childish behavior, making jokes or refusing to take orders from others. Souichi feels immensely pressured by his duties and thus feels a need to be "perfect."

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In order to deal with the pressure, he developed a coping method where he loses stretches of his memories after making a mistake or finding himself in a bad situation. He then has to have them re-implanted by his attendants.

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His public persona is Hachina Naoki, who has a position in the Cabinet Intelligence and Research Office (CIRO).

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Hachina is also one of the people behind the creation of the ACIA.