Name: Rokudenashi Majutsu Koushi to Akashic Records
Alternative tittle:Akashic Records of bastard magical instructor
author:Hitsuji Tarou
Illustration: Mishima Kurone
Label: Fujimi Fantasia Bunko
Translation: https://crimsonmagic.me/
Summary: Sisti attends a magical academy to hone her skills in the magical arts, and hopes to solve the mystery of the enigmatic Sky Castle. After the retirement of her favorite teacher, the replacement, Glen, turns out to be a tardy, lazy, seemingly incompetent bastard of an instructor. How was it that Glen was hand-picked by the best magician in the academy!?
This seems to be fairly popular novel recently in japan and got manga adaptation (four chapters translated). My protagonist is also really hilarious. Well I myself only read manga and decided make thread as bait to get some info form japanese speaking comrades.