Cool concept. I didn't really click with the strategy though, cannot get past (presumably) the final boss for the life of me. Still, neat idea and cool that you managed to make it work and include three fights.
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For the final boss, the strategy is to waste his heal as the first action (unless he casts inferno, in which case you cast it again on yourself and then status swap it). You want to keep Better You on fire since he will out-damage you otherwise. When he uses purify, cast fire on yourself and then swap the statuses. If you get lucky with the RNG, you don't even need to use Hiro's heal, but this strategy is consistent enough that you should win every time with it as long as you can adapt to some variations in the RNG.