Looking back on this ...
Bottom line: This is honestly a very bad 'game'. But a pretty good 'nukige'.
At pretty much the start of the game they force you to get millions of gold, but you never use it. Yet they unironically give you chests after that with like 1K or 10K gold in it. So stupid.
Then by the time you get that (going through scenes) you've gotten to be pretty much immortal to anything roaming the land (max level armor & weapons).
You one shot everything and nothing hurts you, so gameplay here is an afterthought and serves to do nothing more than to get you from place to place, scene to scene.
While that in and of itself would be fine enough, it'd just be a game w/o any meaningful gameplay, but still pretty good H-content serving as a plain nukige.
But then to actually finish the game they throw some lame OP boss at ya, which kills you in 2 hits and is pretty much immortal unless you start grinding your life away.
Even if you bring a partner in combat, the resurrection items simply DO NOT WORK. For as far as I can tell, almost none of the items work (barely any have a description, and I guess only the ones with a description work).
I can't remember the last time I saw such poor, idiotic game design along side such broken ass mechanics.
But like I said above ... the H-content is pretty good and there's pretty much no gameplay to the game anyway.
But if you want to finish the game, prepare to curse your life grinding.
NOTE: I did manage to eventually 'cheese' the final boss via what is probably another bug. I used Bass as a second party member, but for some reason HE was immortal against any and all attacks of this boss. Equip HP recovery accessory to yourself, and let Bass use the minor healing potion. You just spam the Goddess Power attack.
So ya just gotta be very lucky the boss doesn't decide to hit you twice in a row (since revival items don't work).
Though as mentioned here before, the reward is not worth the effort.