Danbooru-based image board with a specialization in high-quality images.
refeia tentei_gakuin_no_shindatsu_majutsu_shi thighhighs wallpaper

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天帝学院の侵奪魔術師ドメインテイカー ~再臨の英雄~
Tentei gakuin no shindatsu majutsu shi domeinteikā ~ sairin no eiyū ~

It's a light novel, I guess I'll tag it.