@Thndslz , I'm agree an arc will have 3 volume , and I think the volume 6 will be the climax of the Second Arc. (I have checked the WN, it's very promising, but because it's just a web novel so the author make it rushed and raw). The light novel is going slowly and more logical.
@Degernase
the manga do not explained many things at this point. When you have time, read the light novel from vol2 - vol4.
If you're still not like it, perhap this manga/light novel do not for you.