Ashford, Prince Notoria, and his friends from the Regulus Squad are on the journey of their lives. It’s a dangerous mission when the group can be destroyed in the Vesper disaster. The player will take on the role of a prince trying to save his kingdom from destruction. Everyone living a normal life feels suffocated now. But he has to rush into purgatory to stop the cause of everything. Regulus -The Advent- is just like that, a suicide, an expedition, a journey, an adventure with unpredictable results.