Yuta, a boy who was sent to another world with his classmates.
It summons and uses earthlings who tend to have high values in a different world where humanoid machines called "magic machines" are operated with the special power "Ludia" contained in humans.
Yuta's Ludia value is only "2" while many friends are buying at a high price. Yuta was bought at the "lowest price" and turned into a slave, but the encounter with the white magic machine "Arleo" awakened him to a strong man-- !?
From the lowest priced slave in its class, the new world Mecha Battle Entertainment has begun to become the strongest hero who shakes the world!