Isekai Rondo

I'm gonna be frank. I dunno what the other people are doing, but it probably involves using the unreasonably good gear well before you need it. Quite frankly, you don't need to play on the highest difficulty to have any challenge. You can probably get it on any difficulty more comfortably than on the highest difficulty. Step 1: use reasonable gear. None of that P2W gear till bosses start getting tanky enough to require it. If you balance around common mobs being difficult, bosses will be a slog. You can probably stop holding back around the 4th dungeon on the highest difficulty. Feed most of your perma stat increases to your foodie once you have her. She will get more stats than others, especially from fruits. That doesn't mean DON'T give them to the others, but she's gonna be your strongest character most likely. Step 2: Use your free P2W currency for QoL upgrades, not damage ones. That means buff your rare droprates, unlock free fruit drops, unlock free upgrade drops, and buy the item that gives x2 droprates once, etc. x2 exp/pp are also a reasonable "investment", as then you'll keep up for longer. Step 3: The 8 keys are great value, but you won't need that stuff for some time. Once you want better gear, get them and find the doors. They are in town. Only after all these things are done should you consider spending the freemium currency on the weapon gacha. You reaaaally won't need it, and using that's just gonna suck the fun out of the game unless you need it.