Chuubou Sonken

As the unexpectedly revealed younger sister of Hakufu, this brilliant strategist brings a sharp intellect to the Great Guardians storyline. Unlike her illiterate older sibling, she possesses a profound mastery of ancient wisdom, frequently citing the legendary Sun Tzu to demonstrate her vast knowledge. While her sudden arrival reshapes the family dynamic, her subtle, developing affection for Koukin adds a layer of romantic tension to her journey alongside the Sun clan.