Hinako Nakayama lived as an orphan and never met her biological parents. One day while trying to make it to her entrance ceremony and runs into her own twin brother she’d only coincidentally met. He claimed he hurt his foot when running into her, so he wants her to go to his entrance ceremony as him. His school is known as Shishiku and his name is Onigashima Hikaru. Due to his constant blackmail, Hinako agrees to pose as him at the entrance ceremony.