The hero of the story is Kappei Sakamoto, a high school student with incredible athletic abilities who joins the basketball team at Seirin High School and quickly becomes one of the most skilled players. Kappei has one unusual disadvantage for a basketball player - his height; he stands at less than one meter tall. His Achilles' heel is female undergarments; he has a particular fascination with white panties, and he becomes even more eager to join the basketball team when he discovers that the team's female coach, Coach Natsu, wears white panties (although his creative attempts to sneak a peek at those panties usually end with him receiving a physical beatdown from the hot-tempered coach). Eventually, Kappei's athletic talents extend beyond basketball, and he tries out for - and excels at - every sport the school offers. In the first episode, Kappei meets and falls for Akane Aki, a sweet, pretty girl who is quite athletic herself (she later joins the school's ping-pong team) and signs on as the assistant coach of Seirin's basketball team. Much to Kappei's delight, not only is Akane beautiful, but she also wears white panties, and Kappei sets his sights on winning her heart. Kappei eventually moves in with Akane and her family after his parents (who are rarely around) leave for the United States. However, Kappei has an unusual rival for Akane's affection - Akane's dog, Seiichiro, who has often fantasized about marrying his owner and, resenting Kappei, immediately seeks to sabotage his relationship with Akane through various tricks. Seiichiro can also speak, although only Kappei can understand him.
