Fifteen-year-old Isaku Senagaki, the granddaughter of the third boss of the Senagaki crime syndicate, just wants to have normal friends and a normal high school romance. She enrolls in a high school far from her hometown, but the overprotective young leader, twenty-six-year-old Keiya Uto, lies about his age and bribes his way into the same school as Isaku! Telling Isaku she's too young to fall in love, Keiya's ready to scare off all the boys. But actually, Isaku's had unrequited feelings for Keiya this whole time?!
