Sealed Memories Gamer

A person gains the abilities of a few Seven Deadly Sins and All for One on top of the Gamer ability. He doesn't remember his past. Only pieces of entertainment he used to watch. The path to unsealing lost memories will be difficult. Mavros won't give up though and will try to the bitter end. After all, he doesn't want to die and leave his family behind. Will he like what he finds?