Warning: Spoilers up to the end of Episode 4 follow.
The episode begins right at a flashback which takes up a significant portion of the entire ep. Hiro is at a district track meet competition. You can tell this must be the past because Hiro hasn’t yet quit running and his younger sister Kaede is still sweet to him, unlike how things are presently in the series. Hiro is so good, we see some random people in the bleachers say he’s the ace runner of the school.
Hiro seems a lot more confident at this point in his life. Hiro’s friend, Takafum...