Hinaichi is a vampire hunter and one of the main supporting characters in Kyuuketsuki Sugu Shinu. She works as a highly capable member of the vampire-hunting force and is known for her serious, disciplined personality and strong sense of duty. Despite often being exasperated by the series' absurd situations, she remains reliable, competent, and determined. She plays an important role as a recurring ally to Draluc and Ronaldo, helping drive the story's action and comedy through her straight-laced reactions.