Shiraishi Ryo, an office worker who has been draining his savings on social games, is summoned as a hero and obtains the Gift (Skill) 'Gacha'.

However, the King, unable to discern the value of that skill, imprisons Ryo.

Realizing that he is to be sacrificed for the next summoning, Ryo uses the skill he acquired through Gacha to escape the castle and decides to leave this country.

In the process, his act of taking the castle's treasures as compensation greatly distorts this world.

Unaware of the repercussions of his actions, Ryo senses the corruption in this world and deems it "not worth saving."

He decides to live as he pleases.