The Villainess Turns the Hourglass, Vol. 1 - Antstudio

Aria Roscent mercilessly bullied her stepsister Mielle and paid the ultimate price for her misdeeds--but not before Mielle revealed that she'd manipulated Aria into harassing Mielle in the first place! Instead of dying, Aria is sent back in time and gifted a strange hourglass with mysterious powers. Now, Aria's just got one goal: to embrace her role of villainess and utterly destroy Mielle's life!