|Height||185 cm (6'1")|
|Weight||60 kg (132 lbs)|
|Birthday||April 10th, Aries|
|Team||Mikoto Middle School|
|Talent|| Defensive Rebound|
Kai Osaka (カイ大阪, Ōsaka Kai) is 14-year-old player at Mikoto Middle School. He was the star player during middle school and now he is playing basketball in high school further.
Kai is a fair-skinned young man, who has short dark grey hair and grey eyes. Kai is tall and athletic, measuring 185 cm. He can usually be seen wearing a white shirt under a black jacket with yellow buttons. He also wears black pants and black shoes. His jersey number is 10.
Kai is a very popular person. He is confident in his abilities.
Kai was born in Tokyo, Japan. During middle school, Kai proved that he was talented in every sport. Thus, he joined every sport club his school had, but became bored of them soon after. One day, he decided to join the basketball team because he saw Abura Sasaki playing, who was at that time the most unpopular person in the school, but who was a better basketball player. Kai wanted to join the team to outperform Abura and he succeeded. Abura hated him for this; they always played a one-on-one match, which Abura always loosed. They became rivals. Kai started to love basketball and he finally became friend with Abura. They also became the two stars of Mikoto Middle School.