Sošite haširidasu (E13)

The Kansei University track team runs into Tokyo Sport University at Lake Shirakaba, where they're holding their training camp. Sakaki insistently provokes Kakeru over his past actions. Pushes to his limit, Kakeru grabs ahold of him, but his friends come between them before anything can happen. Later they begin their grueling practice, but Kakeru can't stop recalling heavy memories from his high school days: a cruel past that pushed a group of elite runners to their breaking point. Recalling how he chose his own destruction, Kakeru agonizes over his past. That night, the sky is full of stars. Haiji appears next to Kakeru as he's hanging around by himself... (Crunchyroll)