Shizuru Kousaka is a supporting character in the 'Taimanin Asagi' series, a dark fantasy visual novel franchise. She serves as a skilled Taimanin (demon ninja) and is known for her calm demeanor, intelligence, and strong sense of justice. As a reliable ally to the protagonist Asagi Igawa, Shizuru often aids in missions and combat against demons and corrupt organizations. Her loyalty and tactical prowess make her an essential member of the Taimanin team, contributing significantly to their ongoing battles.