18+ Isekai Yurutto Survival Seikatsu: Gakkou no Mina to Isekai no Mujintou ni Teni shita kedo Ore dake Rakushou desu

I'm Shinomiya Hokage, a 3rd-year high school boy who dreams of a survival life. One day, everyone in my school transferred to a mysterious island in a parallel world. I woke up in an unknown cave and I started moving on my own. Then, I met up with some of my classmates. My knowledge and tools in survival shines through. I was a plain guy in school but I'm the leader in this world.

(Source: Novel Updates)