Natsu Koi Slow Line

Hikari transfers to a new school and becomes the manager of her beloved basketball club. Yamato, the ace who shoots beautifully, is unsociable. But he occasionally shows kindness, and Hikari is increasingly drawn to him. Meanwhile, Hikari's childhood friend and Yamato's best friend, Riku, has had a crush on Hikari ever since they were children. And Yamato...

(Source: Shogakukan, translated)

Note: Includes five extra chapters.