Can someone tell me which chapters of the novel was this?

It should be somewhere in the beginning of the 4th arc, I think, so chapters 62-70. But I recommend to read the novel from the beginning, it's worth it

Thank you! Then i think i'll read It from the beginning ε=ε=(ノ≧∇≦)ノ

i 100% think you should read from the beginning!! its such a good novel you will not regret it!