Beautiful swimmer who continues to be raped after despair, a swimming club coach is tainted by a young cock that can't be stopped

When he was a student, he was skilled enough to win a national swimming tournament, and as a teacher he was assigned to his alma mater and became an advisor to the swimming club. It was once a prestigious swimming school, but the times have changed, and the swimming club has been weakened and is at a risk of survival. He was given the responsibility of rebuilding, but his passion for teaching was running wild and a huge gap between his students was formed... The gap gradually deepens and the students turn into hatred and plot something...