He is a Lieutenant Colonel of the Japanese Imperial Demon Army and the commanding officer of the Vampire Extermination Unit, Moon Demon Company. Guren would become a wise leader who values teamwork, co-operation and friends, and determined those were necessary to ensure the survival of the human race from demons and vampires. Sometimes pretending to be lazy, in truth, he really works hard. He keeps many secrets to himself, and has no difficulty lying about them. When enduring hardships in battle, he will focus on winning and take the most direct path to that.
