Yuuta was sent to another world with his classmates.

In this world, there's an unique power called "Ludia" which is used to operate humanoid machines called "Magicrafts," Earthling are summoned to be employed because they tend to have high values. While many of his classmates were bought at high prices, Yuuta's Ludia value was only "2"...

Yuuta was sold at the lowest price and became a slave, but when he encounters the white magicraft "Arleo," he awakens as the strongest!?