Found what seems to be the issue, just drop this mayu_events.rpy file into the /game folder and it should work again.
If you don't trust this file and want to do it yourself:
- decompile mayu_events.rpyc
- change line 616: Show("cons_2nd_room") to Jump("cons_2nd_room")
- save new file as mayu_events.rpy
- place new file into /game folder