The Greatest Wolf of All Time

At the end of the world, a college student returned from studying abroad. On his way back, a giant lizard appeared out of nowhere and attacked the plane he was on. He survived. A weird system has taken over the entire world and brought monsters to the earth. The country collapsed and the whole world was destroyed by blood-eating monsters. Leon is trapped on an abandoned island. How to save him? What will happen to him? What will the world be like in his absence? Will he even manage to return? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.