Eiyuu Onna Kishi ni Yuunou to Bareta Ore no Bijin Harem Kishidan - Gaikaku Hikume no Kijutsu Kishidan

Gaikaku, a genius mage with unparalleled magical prowess, lives in quiet seclusion under the employ of a gluttonous regional lord, Borick. While earning pocket change through secretive assignments, he devotes himself freely to magical research, surrounded by a diverse group of girls from various races. However, after taking down a certain elite elf, his incredible talents as a mage begin to draw attention across the land...?!