Ro-Kyu-Bu!

Ro-Kyu-Bu! (ロウきゅーぶ!) is a Japanese sports comedy light novel series written by Sagu Aoyama with illustrations by Tinkle. The novels are published under ASCII Media Works's Dengeki Bunko imprint, and eight volumes have been published since February 2009. Ro-Kyu-Bu! has been adapted into two manga series, an anime television series and a PlayStation Portable visual novel.

Plot
High school student Subaru Hasegawa decides to stop associating himself with basketball, despite his love for the sport, when his school's team captain was suspected of hitting on a girl much younger than him and the club is disbanded for a year. His aunt, Mihoshi Takamura, then assigns him to be an elementary school girl's basketball team coach. Initially, he accepts to train the girls just for three days, but after learning of their circumstances, he decided to keep coaching them.