Ukei Kaito, the protagonist who desperately saved the world after being summoned into another world as a hero to defeat the Demon King.
Although he defeated the Demon King and saved the world, he was betrayed by the people he trusted as friends and is stabbed to death by a sword.

At that time, he swore.
If there is a next time, he will no longer cling to the word called "believe."
If there is a next time, he would pay them back as ruthlessly as possible.
If there is a next time, he would not make another mistake.
「And ... All of you ... I absolutely will kill all of you ......」
After leaving his last words, he died.
And then a voice sounded.

【System message: tutorial mode completed】


That type of isekai, who does not have a truck, that the protagonist is not a robber of skills, has no one to protect, just a hero who defeated the demon king and was betrayed by his friends, his weapons?
Hate and revenge, after reincarnating his goal has become revenge for all the people who betrayed him, it is the plot will walk in this rhythm, a very promising manga where the protagonist does not fuck, does not want to know of any consequence only wants to be avenge !