I keep coming across the error I've attached here whenever the first boss fight ends and it fades to a different screen, which unfortunately makes it so I'm unable to progress. I'm really loving the game so far and would love to continue it! 
Viewing post in Brave Hero Yuusha EX comments
Hey! Thank you for letting me know. It seems some Steam version data was left in the most recent build that shouldn't be there. I'll get this fixed up ASAP.
For now, I've downgraded the active download to v1.1.1, which has very few differences compared to v1.1.2 and does not have this problem. I'll undo this change soon when the bug is fixed.
Huge apologies for the inconvenience! :(