From MangaHelpers:

Tachibana Tatsuya's father passed away, and he and his mother have a hard time making ends meet. To help with their situation, he chose to become a part-time worker instead of attending high school. From his father, Tatsuya had developed a love of basketball. When he isn't working, Tatsuya plays basketball with his two friends near the Kamakura shore. They earn money by playing other people in games of 3-on-3 for cash. One day, Tatsuya's life changes forever when he meets an older guy named TJ. TJ is interested in Tatsuya's style, and he introduces their three-person team to the world of street ball. [tethysdust]