page 1 :
- giant dragon : ... dont forget to bring miyage , ok ? i like to eat big fat humans , lol .
https://en.wiktionary.org/wiki/土産#Japanese
土産 / miyage :
- a local product, native product, something produced in the area where it is sold .
- a souvenir .
page 2 :
the giant dragon uses " 主上 " to call the black guy .
https://en.wiktionary.org/wiki/主上#Japanese
主上 = Your Highness; His Majesty (the emperor or monarch) .
- black guy : ... watashi ...
page 4 :
- black guy : ... i shall leave the fate of that reborner to you . you can use him as a $ex slave , lol ...
page 5 :
- giant dragon : that hurted , you bastard . for a reward , pluck out your own scale / your own hair , instead of plucking out other peoples 's ones . you took my scale without my consent ? what is next ? you will take my virginity without my consent ?
last page :
now the class-room has no tables and no chairs . my guesses :
* in chapter 1 , the attack destroyed the students and the tables and the chairs .
* and / or : this room has become a crime scene , so the cops sealed it up .
* and / or : the school thought : this room was cursed / this demonic room ate the students . so they sealed it up .
* and / or : this room has become a shrine for the dead students .