A high-tension high-school romantic comedy with a heroine whose pure love is like an attack! Due to her scary face and penchant for fighting, high schooler Mihane Hirata is known as the "Killer Demon." But, she's actually an earnest 16-year old in love ... While trying to get closer to her beloved Toma, the cutest guy in her class, she accidentally confesses her love to him! Not only that, but before Toma can respond, Mihane suggests that they try dating for three days ... ?!

Her face might be a bit scary, but Mihane Hirata is the most pure-hearted high school girl you'll meet. Mihane's beloved Toma has already turned her down, but now it seems like he's starting to fall for the powerful Mihane?! Around that time, a rumor starts going around that Toma has a stalker—but it's none other than Mihane trying her best to protect him?!

Final volume! Mihane has finally started dating her beloved Toma-kun!! Toma-kun is acting like a shy girl, and Mihane is so happy she almost seems macho. But just as Mihane is enjoying the dating life, Toma-kun's beautiful ex-girlfriend appears and throws everything into chaos?!