Lilith: Origin of Succubi - Chapter 227

The low-ranking behemoth, the iron mountain is invincible in the horizontal push, and it is called the king of the backing.

- Description from novelbuddy

It all started when a minute before we began morning activities, something suddenly occurred. The floor started shining a dazzling light, the shining expanded in an instant, and 30 classmates, including me, were laying on top of a place we didn’t recognize.

You thought being reincarnated as an extra-side character was bad? Imagine being thrown into the body of a villain who is disowned by his own family and discarded by the author.