I'm too hooked

Even without spending money, you can get really strong weapons and equipment based on your login days and cleared stages, so there's no need to force yourself to pay! I personally love the tactic of using a weapon that generates wind forward every time I reload, and then using the ultimate skill at the end of reload-based enhancements, which limits me to one shot but makes reloading incredibly fast! By the way, it's also fun to add a skill called 'Sanction' that damages all enemies within range every time you reload (I call this the 'Clatter-Clatter' tactic). Recommended for those who are okay with realistic zombies, bugs, or bats and want to play a survivor game!