Risou no Kanojo

A new student at a prestigious academy, Seiji is approached by a girl who asks him to pretend to be her sister's boyfriend to prevent their mother from arranging a marriage. Her sister, Sara, is a popular and beautiful student from a wealthy family. Seiji agrees to the arrangement despite not understanding why he was chosen. As they spend time together, Sara appears genuinely happy, confusing Seiji about her true intentions. The situation becomes complicated as the fake relationship blurs the lines between pretense and reality.