There isn't a way to save due to RPG Maker MZ's handling of Message Boxes. You can't really do anything during a sequence of messages other than press ENTER or ESC, both of which just go on to the next message. Adding a SAVE menu during the day kind of throws off the pacing, but I might consider adding them in places. Other than that, I'm thinking I'll either add a "RETRY" option after a bad ending, or just make it so there are no bad endings and have the game continue after losing the battle (Winston intervenes and saves you, Chiyoko blacks out and unleashes some crazy latent power and drives the enemy away, etc) I was moving towards the latter solution, but burned out and ran out of time.