While the closed beta test of the SEVENTH DARK already running X-Legend Entertainment Japan announced the OPEN beta test version of the game which is scheduled to run from August 18, 2016 15:00 (local Japan time).

In the OBT version now you can level up your character until Level 62 and you will have 2 new dungeons and maps but if you are a closed beta tester you can already play on these extra maps.
After the service ended don’t worry, you can move your save data file into the official, final version of the game.