Cleanup hitter on Eisen's baseball team. He attended the same junior high school as Ami, and she considers him a good friend. Has a short-temper and tends to resort to violence a lot, but it's actually pretty clever and considerate with people he likes. In junior high, he promised to beat up anyone who asked Ami out on a date, and he followed through several times, even sending a few to the hospital. After doing poorly as a pitcher because of an elbow injury, he switches to third baseman. He is also ranked first in the intra-school marathon, and is regarded by his friends as a natural-born athlete, who can do well in any sport he tries. He moves back to his hometown during the summer of his second year in order to be closer to his ailing mother. In his departure scene, Keisuke tells him, "If baseball was an one-man sport, you'd be in Koshien (National Tournament) every year."