String metal, harmless to ordinary people, an important resource for human development.
It is also the source of all rebellion.
A race declined because of it and was eventually named "devil".

The story will unfold with the nameless "devil" boy and the human girl Jonah who protects him.
Jonah have to choose to leave for special reasons.
Without knowing anything about the world, the boy is gradually involved in the whirlpool of fate.

“where are you.. Jonah..”

A haughty girl Knight
A Kind Human Girl
Ultimately, how will you choose?

[From Steam]