Being kidnapped against one's will to another world under the pretense of defeating the Demon Lord was a luxury that not everyone could afford.  Ivan Weiss is unfortunate enough to be dragged into this mess with other four students. It didn't stop at that, he was soon kicked out after a skill reveal process showed that he possessed a skill of unknown use. Unable to go home, betrayed, and bitter, he vowed to find a way back home with any means necessary and took revenge to the ones who made him felt this way.  But, with weird passive skill [Assimilation] that was barely unreadable, would his revenge turn to dust?