My Master Is a Thousand-Year-Old Monster

She is an ordinary student during the day, but at night she is summoned by the monster to another dimension, becomes the monster's apprentice, and helps the monster do things! It is her ultimate dream to escape from the clutches of monsters and have a good night's sleep! As a student in a key class, not sleeping well really affects your grades! As long as you work hard enough, an iron pestle can be ground into a needle! As long as she is boring enough, even monsters can be pissed off by her! When the monster dies, she is free! So she worked hard every day to piss off the monsters, piss off the monsters... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.