Guren was naive in his childhood days and spent most of his time with Mahiru. His aspects on life felt simple as he was in his happy moments. But after he was treated with disgust due to his name as a lowly born branch member, he began to feel guilt. He though that because of his weak physique and power, he couldn't reach out for what he wanted, which was hinted to be Mahiru. She motivated him to become stronger and wiser.

    He is a wise leader who values teamwork and cooperation, determined to preserve the survival of the human race from demons and vampires. When Yu wanted to join the Moon Demon Company, Guren refuses to allow him until he made friends.

    He pretends to be lazy, but he actually works hard and keeps many secrets, which he has no difficulty lying about. He plans to dethrone the Hiragi Family.

    He cares about his subordinates and friends, considering them to be family.

    Guren was born into the Ichinose family, a low branch family of the Hiragi. He was also the best friend and lover of Mahiru Hiragi, but this was frowned upon because of his low birth. Since they were friends, Guren was treated badly and blamed for, also getting beaten by the adults.

    He appeared at the end of chapter 1, using information from a prophecy to collect Yuichiro Hyakuya, a survivor of the Hyakuya orphanage. Guren has led Yuichiro to join the Japanese Imperial Demon Army after the moment he has escaped the city of vampire. He is secretly attempting something to reform the Imperial Demon Army governed by the Hiragi Family.

from Wikia, want to read more?

 

 

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