Secondary Vocational Students Travel Through the Swallowing Starry Sky and Encounter the System

I imagined that I could dominate the world and sweep through thousands of armies after traveling through time, but when I opened my eyes, I found that I was just a cannon fodder being chased by monsters; In desperation, he awakened the "Become Stronger after Being Beaten" system, but the first task issued by the system was - "Please take the initiative to be devoured by the main-level monster. The reward: be invincible for three days."