SSSerpents: Trust them to die!

"Snakes all around... No one, including parents, could be trusted!"
The story is about a boy, Kato Tadashi, who finds bullies and gangs during his high school days. Instead of defeating them, he walks on the path of his mentor and becomes one of them. Since he is not good at physical fights, he tries to walk away, leaving the game behind, but it was not his fate.

He remembers all the teachings of his mentors, who taught him to use his brain to the utmost limit. Staying in that gang, he brings a revolution, destroying others and ending up hurting himself.

Reincarnating is fascinating. but for those who haven't gone through it. And Tadashi is not of that kind. Executing his final and most destructive plan, he takes his own life, making people lose their hopes and faith in him.