If it's set as completed and it looks completed, then it's probably completed. (There could be more room for extras)
Basically, MC & game developer guy (GDG) get sucked into GDG's video games thanks to MC's family-heirloom-talisman-thing. Story isn't completely formatted into 4 Koma, as they're not quite the center of the plot. It makes up like 1/4 of the content though, and probably skippable.
The Honest Life of a Game Studio