Full-Time Magister: Chaos of Time

This world is overrun by demons, but Xianyu, who had latched onto a powerful ally early on, decided to slack off once he reached a high rank, believing that the taller ones would hold up the sky if it fell. However,
...How did I become a super-level?
...How did I forbid a spell?
...Why did I get on the roof?
…How could I…
Male protagonist: Xianyu (a lazy bum???) (Not a time traveler)
Innate Talent: Chaos of Time
(Please point out any typos (?ò?ó?))

Novel keywords: Full-Time Magister: The Time of Chaos (no pop-ups), Full-Time Magister: The Time of Chaos full text download, Full-Time Magister: The Time of Chaos latest chapter reading