When the Incubi emerged, humanity was rocked to its core. These otherworldly monsters invaded the world and captured humans, using them for breeding purposes. Only the Witches, magical girls bestowed with powers from supernatural beings, stand a chance against the creatures. High schooler Renka Azuma happens to be one of them, and fights back as Silver Lotus, a witch who can control swarms of insects able to devour the Incubi. Her days are lonely but her mission is clear: destroy every last Incubi out there.Things take a turn when Silver Lotus comes across a novice witch named Azure Nova, saving her from a close call. She's surprised to learn that Azure is a self-proclaimed fan of hers and wants to work together! Suddenly, her dark, solitary days begin to grow a little brighter. But the Witches have a responsibility to protect humanity so can they really afford to make friends and live like regular teenagers?