Magic In a Modern World

hundreds of years ago humanity almost Extinct it self of the power of Magic a Mage called Yui, have a power to remove and disable enemy's Mana and magic, Due to her power being oveflow she Self distract herself, making a huge shockwave of mana drain in the Entire World, hundreds of years later a girl name Aliah, Stumble a Ring in the grassy field where she lives.