Teens you all are teens in the story also AA stands for Accourt Academy
You are the type ???/normal Specialist you're in Accort academy with 17 other students who are: Arisu (girl) (fairy expert) Miyako (girl) poison expert Tamiko (girl) steel expert Vangelis boy flying expert Masaru boy dragon expert Haruki boy fire expert Kokoro girl ice expert Ayame girl dark expert Yuuka girl ground expert Daiki grass expert boy Takis boy psychic expert Yori boy ghost expert Naomi girl water expert Kane boy electric expert Katashi boy fighting expert Setsuko rock expert and more