She Professed Herself Pupil of the Wise Man Kenja no Deshi wo Nanoru Kenja English Subbed

Kagami Sakimori plays as the great mage Danblf in his favorite MMO. He falls asleep after a night of testing new character appearances, but instead of waking up to a suspended game, he’s inside of Arch Earth Online—as a girl! Now named Mira, he must convince the game’s people that Mira is a pupil of Danblf, who vanished without a trace 30 years ago…and figure out how he got here. (Source: Funimation)