Sakura's father. A powerful martial artist who, along with his wife, runs the dojo on Tatsumiya Island. Has a pretty serious and strict personality. Seiichirou is the commander of the Alvis air defense combat team Bergelmir. His squad flies out of face the first assault of the Festum in the first episode of Dead Aggressor. The whole team is destroyed in the attack, however, and Seiichirou lost his life.
