This is Alchemia Story Operation Team.

We confirmed a bug in some One-Time Parties after our maintenance on December 11, 2019.
This issue has been fixed today at 15:40 (JST).
Restoration is complete and we have confirmed that the game can be played as usual.

One-Time Parties that were affected
・Valley of the Wind
・Fire Cave (Abyss)
・Elementary level Satan Claus
・Intermediate level Satan Claus
・Advanced level Satan Claus
・Advanced+ level Satan Claus

We sincerely apologize for any inconvenience caused at this time.