Chiyu Mahou no Machigatta Tsukaikata ~Senjou wo Kakeru Kaifuku Youin~ Chapter 70 Discussion

I'd recommend the Manga rather than the novel but I loved the story. The MC is sufficiently fleshed out and the aims are well established. In short, it is an underdog story with spartan training with unexaggerated "Oh MC is so OP" moments. Enough mystery, enough lightheartedness and a nice story