So he has countless magic skills and his mana is still this low, but Christer-La-Christer's mana was quite vast with only one skill? Why? I really hope they'll explain it somehow, because right now it doesn't make much sense.
Edit: It is explained later on. Normally, the amount of mana one has cannot be increased even with practice. What the skill he copied from Christer does is allow to increase the amount of mana with training.
Also, I genuinely hate the trope of the protagonist constantly chasing someone even though they constantly meet / almost meet. Fuck that.