Do Retry was an interesting series. It was set in a post-World War II Japan with a sick sister and rough brother who gets pulled into underground boxing tournaments to try to raise money to help his sister.
The series followed Aozora as he tried to raise the money for his sick sister by boxing. The series progressively gets better as it goes on as Aozora learns to be a better boxer. It was an interesting, and grittier sports / boxing manga.
All that said, when it was clear the series was being canceled - the way it ended was...less than stellar. Aozora's father was a Japanese soldier in World War II. And disappeared.
But, then is discovered to be living in the wilderness for reasons, hiding from all of his problems.
And then Aozora finds him using his underground criminal friends to help. And then they box. And Aozora kind of wins, kind of. Mostly makes his Dad realize he needs to go home and stop hiding from reality.
And then it just...ends there with the sister becoming quickly better. Surviving. And then a time jump to modern times where Aozora is merely a dying grandfather whose life story encourages his young adult grandson to be more motivated to folow his dreams.
It's...okay. Early chapters were a little rough, but the middle chapters really hung on & hit its stride.
TL;DR - This boxing manga series gets better & better until the Dad is revealed and...eh, it ends. And the timejump was unnecessary.
MDMRN