Yumiko Koizumi

Enrolled at Camelot Academy Japan School (Class B). A formidable opponent who first fought with Gawain and Lancelot, and an expert in Iron. She is also the official girls' Jr. champion. Participated in official matches after moving up to Class A, but dropped down to Class B right after. Initially, she was a tough opponent with intense backspins, but later did not improve significantly and became an average character within Camelot Academy. She is lively and unpretentious, and is one of the more upbeat characters at the Japan school. She was smitten with Lancelot, but her enthusiasm cooled off after an offhand remark from him. Subsequently, she became a professional women's golfer, sometimes competing with Percival on the tour as depicted.

Initially, she was passionate about golf, but gradually her enthusiasm for golf waned and her behavior became flippant. She started estimating male characters like Cuestor and Tristan, and repeatedly described others' serious feelings as "childish" or "misunderstood," behaviors which Lancelot pointed out with irritation. This made her a contrast to characters like Platillissa and Bridget, who had been consistently devoted and successful in love for years.

She has a brother who has appeared, but she seems to have little interest in him.

Average driver distance: 195Y

Average putts: 2.1

Best score: -1