The manga is about a young boy who doesn’t have an 'alter' like the others of his age,
which makes it difficult for him to enter the high school of his dream.
He dreams of becoming a hero in a world full of villains who try to kill the heroes.
At the age of 15 he is accepted into his favourite high school: Yuei High School, where all
the heroes including his idol All Might are trained.
One day he is attacked by a villain and All Might comes to save him and that’s when the
young man called Izuku becomes the student of his idol and All Might gives him one of
his hair that Izuku ate and thanks to it Izuku received the power of his  idol.
We follow the life, the experience and his new meeting during 4 seasons.