Historically, balancing the game's character forms presented distinct challenges. Players often found human states too weak or their alternative states overwhelmingly powerful. The V2025.02.07a update flattened this scaling curve, introducing: Fixed caps on long-term static buffs.

The succubus, known as Erebus in her previous life, had lived for centuries, feasting on the desires and dreams of mortals. Her kind was feared and revered, for they held the power to manipulate the deepest desires of those around them. But Erebus had grown tired of her immortal existence, and in a moment of weakness, she had been defeated by a powerful sorcerer. Her soul was banished to the mortal realm, where it awaited rebirth.

: The core title of the intellectual property. In independent gaming, "Succubus Reborn" can refer to a variety of community projects, including specialized gameplay-overhaul patches, strategic card-battling simulations, or dark fantasy role-playing modules.

The resource for playing cards, known as (想力), loosely translates to "Imagination Power" or "Energy". Each point of damage you deal with Sakusei generates an equal amount of Souryoku, which you can then spend to play more cards from your hand. This creates a deep feedback loop encouraging aggressive play to build resources for even more powerful combos.