People today fall in love from the most mysterious of ways. This statement appears to be particularly true for the wealthy genius playboy Ryou Amakusa. When he nearly drops off the staircase one rainy afternoon, a woman named Ichika Arima saves him. As if by destiny, Ryou experiences Ichika again after that night; she appears to be the very best buddy of his little sister, Rio.Attempting to”thank” her, Ryou tries to woo Ichika using his usual flirtatious tactics just to be instantly taken down, his target creeped out with his own behaviour. Instead of being frustrated, Ryou rather becomes enthralled by her, and he starts to do whatever he could to sneak Ichika’s heart despite getting disgusted reactions every moment.