the machines are only sold out while you have one, except for the one hiding the sewer entrance.
it does seem like a strange bug, that event only triggers when switch 17 is turned on (which happens when you lose)
live2d is what the cutscenes for the neptunia games are made with, as well as some fire emblem games (the headpatting game)
i just added two accessories to the game that warranted buffing the boss, accessories that give you access to lightning and water spells, which work as follows, water hits 2 random targets, and applies the wet state, thunder hits just one, but spreads to any that are wet.
since slimes are weak to lightning it's a bit too good, so i gave the boss more hp and revived the slimes with more hp. but the fight is about the same. one of the later bosses will also attempt to do it to you but by then a reflect ring is available.