All characters are adults.
I repeat, adults.
Minor Explanation
The setting of this story is in an Academy, which is basically a university where most of the main cast are 18 or above. (If they aren't 18 and because I want to write some 18+ contents then this book would have been labelled differently)
And the reason why I choose to call the school an Academy instead of a university is because it's COOL!
Cool detail:
You can make a guessing game of the characters based on their actions to determine their alignments; Lawful, Neutral or Chaotic.
Go into some heavy stuff so prepare yourself (heavy in my opinion)