Frontier Sentinel Hornbreaker-Isekai Mercenary
Monster Hunter meets Break Blade
Sixteen year old Caleb Wong lived a normal life. He is a good son who did whatever his conservative chinese parents wanted. His life was on rails. Then one day he finds himself isekaied into a world where giant monsters threaten the existence of mankind. In defense of humanity are mercenary companies, glory seeking, profit hungry warriors who pitch battle against these giant monsters with Hornbreakers. Hornbreakers are mechanized suits of armor designed with the sole purpose of monster combat.
A destined encounter with mercenary Amber changes Caleb's life forever. A new world, a new possibility. Caleb is now free to pursue his own path. Will this path lead him to greatness? or ruin?
TLDR, This is a teenage isekai power fantasy with monsters a mecha.