Koun-chi 999 no Watashi, Sokushi Mahou ga Zettai ni Seikou suru no de Sekai Saikyou desu ~ Mahou-chi 1 de Tsuihousaremashita ga, Kakuritsu Cheat de Moriagaru ~ is a Manga/Manhwa/Manhua in english language, Adventure series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Born into a prestigious family of magicians, Sachi faced despair when her magical power was assessed at a mere 1. In contrast, her luck stat was an astonishing 999, but to magicians, it was deemed worthless—?