Although that manga appears to be sending the wrong kind of
messages, if such a guaranteed save/load system is in place, well why the hell not; just make sure
not to save at an irredeemable point in time.
@feha
"items lost" pertains to the scenario of her dying during a dungeon run and "reloading".
"items retained" pertains to the scenario of her completing a dungeon run and then "saving" afterwards, including "acquired" loot.