Assassination, escort, intelligence, apprehension ――

Tweight, the ace of the "agency" in the dark side of kingdom, undertake all dirty work for country and support the brave to subjugation Demon Lord from shadows,

In the end, Twenty will get greater achievements more than Brave soon and become the "shadow hero" known to everyone.

The Agency will be dissolved after Demon Lord is defeated.

Twight got a recommendation from his boss.

Since he was brought by an agency when he was a child, Tweight, who has never lived an ordinary life, wants to enjoy everyday life in the same way as people do.

At a later time. On the recommendation of his boss, Tweight decided to register at Builder Academy, which is largest institution in the Kingdom.

What awaits him there is the daily life he craves with his school friends who have unique habits.

Even though demon lord is defeated, that does not mean that the world has become peaceful.

Inherited Demon Lord. Hostile organization. And pus from his own country.

There are still a few conflicts in the kingdom.

It was the beginning of an unstable era with all kinds of threats.

The daily life he is looking for will be destroyed in a short time if he loses calm.

This is a story about an awkward boy who is a former "behind the scenes". Fight, oppose, and try as hard as he can to protect his daily life from him.