MC purchased a pre-release/early-release of the next game of Hero Wars. This game has been a long running series spanning 20 years. The MC is a veteran of the series.

MC has possessed Rain Gray, the leader of the mysterious Black Snake organization with twelve key members. Black Snake is an organization that has been a recurring villain over the long running game series. There have been some members in the past who have died, but the MC and his right hand Aria have never been defeated.

MC does not seem to inherit the memories of Rain Gray so he can only go off of his game knowledge of prior games. The backstory and background of Black Snake has never been previously revealed. The members of Black Snake are all incredibly powerful. By chapter 5, only 3 of the members have been named (not sure if Rain counts as a member) and only 2 have had some of their power set revealed.

Aria - seems to possess blade skills and is a blind swordsman. She is number 2 of Black Snake (unsure if Rain is number 1 or above the members). Her sword may also possess some sort of gravity collapsing ability.

Alice - She is number 12 of the Black Snake organization. Her power seems to be devouring things with her shadow. She is mentioned to be of Gluttony and seems to like consuming humans and inanimate objects. Frequently depicted as being hungry, but not a bottomless hunger (she managed to eat her fill of people in the first chapter).

Rain - possibly 1 out of 12 of Black Snake, and the in game world character possessed by the MC. He has been chain smoking the entire time, time will tell if this is a Chekov's gun scenario. He briefly managed to manifest lightning and when doing so hinted at potentially high levels of damage immunity.

We have not met the protagonist of Hero Wars (and unsure if it is the same protagonist or if each game had a different one). The Holy Maiden is being chased after by Rain as the only clue he has for the new game is that the cover art character was a Holy Maiden. In doing so, they come across the fact that someone has been misusing the Black Snake name, so MC calls together Black Snake to take action. Time will tell what will happen in the future.