You know how they say movies like "The Room" Are so bad it's good? Well that's how I feel with this. The story tries being so Edgy that it's just funny, I can't take anything seriously with how much this story tires to be dark.
The MC obsession with revenge isn't even all that warranted. Sure he was betrayed. But It's not like he suffered all that much besides the pain. Unlike the Bunny girl that watched her friends suffer and be reminded that no one wants her.
The story also has some of the dumbest plots, You a recently freed slave and want revenge? Well just hop in that kitchen and bake a potion that will change an entire person being into a goblin! It doesn't even make sense why this was done. This also leads to plot holes! If you can turn humans into Goblins, Then can you turn a Monster into a Human?
It's a shame cause the premise of someone reliving a world they've saved and have suffered losses in is kind of interesting. Only story I know that does that is "What Came to Mind During My Third Time in Another World Was to for Now, Get Naked"