마왕의 비서 / 魔王の秘書 / 魔王的秘书 / Satan's Secretary / The Demon King's Secretary
Rank: 3400th, it has 348 monthly / 23546 total views.
Authors: Kamonabe kamotsu
Genres: Manga / Seinen / Adventure / Comedy / Fantasy / Slice of life
Status: Ongoing
Summary:
The Demon King has finally awakened. To begin the process of conquering the human world, he decided to start by kidnapping some humans. One of the kidnapped humans was an amazingly capable "Secretary"...! 
She does her work promptly and with unimaginable skill. Because of her, humanity is heading toward danger at Mach speed!!

Raw: http://comic-earthstar.jp/detail/maouno/