In a quiet, seaside town, there lives a young man named Taro Yamada, who has just started working as a home tutor. Taro isn't your average tutor; he's charismatic, intelligent, and has a passion for his work. His new student is none other than Natsumi, a bright but slightly reclusive high school student. Natsumi's parents are often busy with work, leaving her to focus on her studies alone.