Sayaka Arai (新井 纱弥香), named Matsuo (松尾) in the first season of To Love-Ru anime, is a minor character, the classmate of Rito Yuuki in both his first and second year. She is often seen hanging around with Koyomi Shirayuri. She and Koyomi are Haruna Sairenji's fellow members of the tennis club. It is strongly implied that Koyomi is in love with Sayaka.