The file you mentioned, Neptunia.X.SENRAN.KAGURA.Ninja.Wars-DARKSiDERS.rar , refers to a specific pirated release by the group for the game Neptunia x SENRAN KAGURA: Ninja Wars . About the Game
: Includes the "Peaches & Cream Meditation" mini-game for temporary stat boosts. Neptunia.X.SENRAN.KAGURA.Ninja.Wars-DARKSiDERS.rar
Neptunia x SENRAN KAGURA: Ninja Wars is a crossover action RPG developed by Idea Factory, Compile Heart, and Tamsoft . It brings together the two popular franchises into a hack-and-slash adventure set in "Illusionary Ninja World". The file you mentioned, Neptunia