To prove herself worthy as Ruka's bride, newly turned vampire Mito has taken on intense training at an academy for demi-humans to control her bloodthirst. Having been physically transformed into a boy to attend the all-boys' school for her own safety, her next challenge is to keep her composure even when her classmates are turned into girls by the principal's magic! If she fails, graduating and staying married to Ruka will be out of reach! But when Ruka gets turned into a girl, Mito can't help but feel her heart race...