Johan Anderson, a high school teenager in Japan, along with his classmates, is suddenly summoned to another world by an empire that needs a hero to win the war. Each student gets a job that determines their abilities, but Johan gets a job that seems strange and useless: 'Modern Soldier'.
At dawn, as the first light of the sun began to softly illuminate the beach, Johan walked along the shore, his eyes constantly searching for clues that might explain the strange behavior of the Fish-men. The sea breeze carried a salty aroma, while the waves rhythmically crashed against the beach. Johan's mind was racing with various possibilities. According to the guidebook, Fish-men were typically non-aggressive, inhabiting the deeper parts of the ocean, far from coastal areas. But why had they now appeared here, acting so aggressively?
It was a puzzle that kept Johan pondering. His steps were slow but steady, his eyes scanning every corner of the beach for something unusual. As he walked further, he noticed something that caught his attention. A small cave, naturally formed by the waves, was hidden behind some large rocks.