coming-of-age tale; growth story
A narrative focusing on a character's personal growth and maturation, often from youth to adulthood.
This novel is a coming-of-age tale about a boy becoming an adult.
青春小説 is a youth novel, often focusing on adolescent experiences, while 成長物語 emphasizes the process of personal growth and maturation.
Compound of 成長 (growth) and 物語 (tale, story).