Can't stop the heart-throbbing!! A love fantasy of a villainess and a former corporate slave OL!! Determined to save Lapis from a gruesome murder scenario and protect this workplace, Natori-san struggles to change the scenario so that Diana-chan and Gran-kun's relationship doesn't deepen. However, triggered by a sudden battle between her upperclassman and Diana-chan, Gran-kun ends up giving Diana-chan magical training...!? Isn't this going to deepen their bond!? But the person Diana-chan wants to protect as she grows stronger is...? Meanwhile, Natori-san, who has learned about Lapis's terrifying plan...?