Hello!

In the early stages, leveling up really have this thing that I call "Instance Break" where you will be forced to take a break and wait for another day to continue doing the Plot Instances. You may try hard to gain experience from doing stuff like Ninja Exam but I doubt you'll get far unless you have a set of good ninjas already. Instance Breaks come between Lv25~Lv29, Lv30~Lv33, Lv39~Lv40, and Lv42 but these would differ from each player depending on the efforts that they'll give. Thank you.