What the fuck is happening?

Every month after reading the new chapter i keep questioning myself why i'm still reading this. everything is so unnecessary confusing, guren's role in the story is a mess and time to time they keep changing who the main antagonist is. Mostly of the caracters are poorly developed or are being forgotten in the main story. Almost 100 chapters and we barely know Yu's past ugh... (￣ε(#￣)Σ