Kono Subarashii Sekai Ni Bakuen O! Vol. 3 (Light Novel)

Kono Subarashii Sekai ni Bakuen o! is a spin-off to the main KonoSuba series. Written by Natsume Akatsuki and illustrated by Kurone Mishima, it's set around a year before the main series and focuses on the previous life of Megumin.
In Vol. 3,Megumin is working hard at learning explosion magic but consequently has no friends – just like fellow student Yunyun.
Notice: This light novel is written in Japanese.