Tatsuyoshi Kasai (葛西 辰由, Kasai Tatsuyoshi) is a bodyguard who is employed by the Sonozaki family. He is typically assigned to protect Shion Sonozaki due to her distance from the main branch of the family.
Due to a severe injury he sustained in a yakuza battle, Kasai is relegated to less dangerous jobs.
Kasai appears as a large man with close-cropped brown hair and a goatee. He typically wears a double-breasted black suit with a diamond-shaped lapel pin along with a diamond-shaped lapel pin. He is always seen wearing dark sunglasses that obscure his eyes.
- The credits of Meakashi-hen state that Kasai dies from liver cancer in 2002.
- Despite this, Kasai is present in Yoigoshi-hen, which takes place in 2006.
- Meakashi-hen. 2004.