They investigated the issue and said I could keep it...sweet! I'm going to sit and anticipate until they "release it" officially. Here's the reply.
Thank you for playing Millennium War Aigis.
Thank you for your patience. We have investigated about the issue.
There was a following failure from March 15th (Tue) after maintenance, till March 16th, (Wed) 04:55 (EST).
We have updated the data to fix this failure.
- Failure that the Unit which was not yet officially implemented, appeared in Premium Summons.
It is now been fixed so that it will not occur.
As for the [Unit without [Unit Name], [-] face icon], there will not be a failure incurred by possessing such Unit.
However, we advise you to not to use it and wait until the official implementation.
We sincerely apologize for the inconvenience caused.
Thank you for your kind understanding and cooperation.
The Millennium War Aigis Development Team