This is a world similar to Sword Art Online. There is no true protagonist, just a few powerful characters who get a little more screen time. When everyone first entered, they thought we'd all have fun fighting bosses together. Instead, a world war broke out on the very first day, and the two biggest factions began a drawn-out struggle. There will be some otherworldly elements early on, and the plot may drag a little, but it won't in the middle or later parts, so don't worry. Anyone who's read my End and Jiana knows my novels get pretty uplifting later on. No way will I make you cry (just kidding).
