Top 7 in Top 10 anime with the most attractive mage theme can't be missed.
Isekai Maou to Shoukan Shoujo no Dorei Majutsu - The Demon King Part 2
In the game, Sakamoto Takuma is referred to as the "demon king" by other players, he was somehow summoned to his favorite virtual world MMORPG named Cross. Reverie, with the appearance of the character he created in the game - the demon lord Diablo. There, he met two girls named Shera and Rem, they tried to use the slave magic to tame summoned beasts with Takuma, but due to his magic ring with the ability "Magic Reflection", the magic The magic of the two is reversed.
They went from ruler to servant of Takuma. Despite being bewildered and worried, Takuma decided to act like his character while interacting with others, using his vast knowledge of Cross Reverie to grasp capture the situation, and go with Rem and Shera to find a way to remove their slave's collar, and help them solve the troubles that prompted them to summon him in the first place.