Mato Seihei No Slave X Goliath reader

Zane Zalmoree an ordinary boy with the obsession of the game Evolve mainly the monster called Goliath a 20 foot creature with greyish rock skin, spikes and barbs on it's back and tail that will increase as it evolve. Its head is rounded and well armoured with large pair of mandibles on the lower jaw. The eyes and mouth of the Goliath glow bright red. When Zane was walking home from the store but was run over and brought to a void with no where to go he chose 4 direction only to end up in the body of a stage 1 Goliath with a system that shows his stats, levels and a shop that can provide skills from the other monsters from Evolved and some others that will make him stronger than them.