The idea of Isen is great the problem is that the rates are garbage, monsters hit fking insane with the gear you are supplied with and is 10000000000000% more pay to win than Jainus. Oh wait its more pay to play actually cause you wont be able to do sh1t with the gear if you cant upgrade it or have insane stats on it.

So yeah move to Jainus at least you will be able to get to 115+10 without suffering too much.