The Strongest S-Ranker

When he was young the King killed his family, he seek revenge to the sinister King. Then when he's on the venge of death an old man appeared infront of him that changes his life, his master. His master teaches him how to use his power and use his anger as a fuel to become stronger amd stronger. When the time has finally come, he and his master with other people who despises the King formed a group and finally attack the Castle. When he defeated the King, Seven huge figure appeared infront of him amd they are the [7 Kings of Hell]. So when he confronts the Kings of Hell, he was defeated and found himself in a mew world where the [System] and [Gate] exist. ...will he be able to take revenge?