Simply put, this book is about a hero with impeccable morals and incredible talent who was the leader of a guild, only to be defeated through underhanded means. He fights again in a new version of the game world for his teammates, accidentally shows off and wins the girls' hearts, and along the way uncovers the secrets of the game world...
Light novel version: "Don't touch my old teammates. If you insist, you're dead." "I hear you're pretty damn good?" "Sorry, I might be even better than you." "You started a harem with both players and NPCs at the same time?" "Don't call it showing off. We call it technical suppression."