A story in which the main character is confronted with issues related to their transition from adolescence (innocence) to adulthood (responsibility). Most typically found in a modern romance story in which the main character has to confront his/her feelings over their first love.
Self-explanatory. High school (grades 10-12) should play a major role in the title. Azumanga Daioh is an excellent example of this category. A typical High school series will include a Sports Festival, a Cultural Festival, and a school Trip.