This is divine work by Takehiko Inoue. It's like Dostoievski writing manga. The human behaviour is perfectly detailed, this is the best manga in this subject I have ever put my eyes on.
I am subjective about the basketball part, as i am a player, but i can tell you that he has some good points there, and some good points in leadership that any team sport can use.
His momentum is great, it blew me away how it kept crawling and digging in more and more misery.
This is some hardcore slice of life. If you're not ready for drama or facing your issues, then step away. If you just finished Slam Dunk, and are expecting an easy read with basketball flavor, mister Inoue will surprise you :)
Also art-wise, it's greatly done - consider his other ongoing manga Vagabond
I would put this manga in the education system , it's really food for your mind