Sayaka Kakei  

, 筧 沙也加

Sayaka, who owns an Ayases fan blog, has been following Ayase's activities closely. Despite her admiration for him, she was upset by the rumor that he began dating Kyosuke after spending time at his house during the mock exam period. However, Kyosuke managed to resolve the misunderstanding and establish a relationship between Sayaka and Ayase. It is worth noting that this situation slightly appeared in the anime.