Saku Natsusawa  

, 夏沢 朔

Saku is described as being tall with long black bangs, black eyes, and delicate facial features. His hair reaches down to his nose, making him stand out among male characters with minimal descriptions of their appearance. Despite being shy and introverted, he has a cynical personality and makes sarcastic comments towards those who mock his friends. However, he has good intentions and struggles with expressing himself. Saku tutors Rintarou and Shouhei with their exams to help them avoid failing. He attracts attention from girls due to his good looks, and even children find him appealing.