Mitsuhisa Hachiya is a 27-year-old male who worked as a prosecutor in the Court of Magic. He resigned after awakening as a magician ("wud") due to systemic discrimination under the Magic Prohibition Law. He then joined the Butterfly Law Office as a wizard barrister ("benmashi"), specializing in defending those accused of magical crimes.

Before his awakening, he earned the moniker "Courtroom Terminator" for his effectiveness as a prosecutor. This reputation continued into his defense work, where he is recognized for his legal skill and ability to secure favorable outcomes. He maintains a reserved and stoic demeanor, rarely engaging in casual conversation with colleagues. Outside of legal work, he plays baseball. His magical ability is hydrokinesis, specifically generating fast streams of water from the air. His familiar is an anthropomorphic pig named Bubuhyi.

A significant case involved his collaboration with Cecil Sudo to defend Mayu Saotome, accused of murdering manager Ken Oizumi. The investigation revealed Oizumi had killed his own employee and Mayu's lover, Masato Namase. Despite their efforts, Mayu was killed by police officer Shizumu Ekuso before the case concluded. Following her death, Hachiya privately visited Mayu's grave.

His background exemplifies the professional challenges faced by wuds within the legal framework. His transition from enforcing magical law to defending those targeted by it underscores societal prejudice. While focused on his duties, his actions, particularly in the Mayu Saotome case, demonstrate a personal investment in challenging injustices stemming from anti-wud discrimination.