She Professed Herself Pupil of the Wise Man (Light Novel) Vol. 9

END OF THE BATTLE, START OF THE WAR Suspecting the oni princess who ruled over the defeated Chimera Clausen was the offspring of a high-level demon, Mira entrusts Kagura with the investigation.
Meanwhile, the pint-sized summoner returns to Solomon to make her report…and get a little R&R with Mariana! But when the investigation reveals the demon mastermind is now after the Oni’s Sealed Casket, Mira, along with three other Wise Men, must rush to thwart the enemy’s schemes once again… Series Overview: Sakamori Kagami was one of the top players in the VRMMO Ark Earth Online as Danblf, a veteran summoner with the gravitas to match his elite status.
When he falls asleep playing one day, he’s transported to a world where the game is reality—but instead of his all-powerful avatar, he’s stuck in the body of a cute young girl! He can’t let anyone know that this little cutie is really Danblf, so he takes the name “Mira” and claims to be Danblf’s disciple. If this gets out, he’ll never live it down!