A Devil Hunter in Public Safety’s 4th Division. Aki is partnered with Denji and Power. Due to the two being chaotic, he is the voice of reason who treats them strictly like an older brother. He lost his entire family to the Gun Devil and started Devil Hunting to get revenge. He is stoic. He is polite and professional. Usually cordial, but has no tolerance for idiots. He has a katana granted by the Curse Devil. That katana kills anything in three strikes but saps his lifespan when use.