After traveling through time and becoming Tezuka Kunimitsu, he and his friends grew up through winning and losing. The story actually uses the protagonist's own point of view to interpret the animation plot.
Tezuka Kunimitsu: Seigaku is the most important, tennis is also important, Atobe, well, it is also important.
Atobe Keigo: Tezuka Kunimitsu is an awkward guy who talks duplicity but doesn't mean what he means. Just read his words in reverse.
The character Tezuka is destined not to put feelings first, to care about Qingxue, tennis, and team members... So he will indeed spend a lot of space talking about his growth, his choices, especially tennis.
Conception: