Kouunchi 999 no Watashi, "Sokushi Mahou" ga Zettai ni Seikou suru node Sekai Saikyou desu: Maryokuchi 1 de Tsuihou saremashita ga, Kakuritsu Cheat de Nariagaru

Synopsis

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...? (Source: Starts Shuppan, translated)