Phantasy Star Online 2 The Animation

Synopsis

"This is the guy the regulars mentioned... He's the troll!" In order to experience multi-party play, the true joy of PSO2, Itsuki's friend Kayano Kota introduces him to his friends on PSO2. While surprised by the way they become their characters through roleplaying, Itsuki nonetheless experiences the joy of working together. However, he's also warned about "trolls" who bother other players with their poor behavior instead of helping them. One day, Itsuki finds himself in a group with a player who refuses to help and verbally abuses the rest of the party. He is the troll "Musashi" he'd heard about...

(Source: Crunchyroll)