A Second Chance - The Starter Of The Series

Ikari, A 17 year old agent, Found some incriminating evidence that could put an end to the Crenshaw Reapers. Though he gets betrayed and is forced to start a new life, far from his old one. After a year of settling down into a nearby city, he enrolls himself into a high school where he meets a new friend. His life is far from normal though, as wierd things start to happen around him. As new people show and old friends return, Ikari is forced to put his new life on hold and tackle the mess he made. Will he finish what he started, or will he die trying? Find out on the next episode of dragon ball Z.

Also you should read in this order for complete understanding:

Ikari's Backstory
A Second Chance
An Inside Job
The Ultimate Heist
The Final Chance