Sayaka is a about slender young girl wear a yellow, orange and green dress and yellow shoes and another scene wear the pink skirt with white line and pink cardigans with pink collar. Sayaka has brown hair and teal eyes.
Sayaka is a very friendly and upbeat girl who considers the health and happiness of her friends (Anna) to be the most important part of her day.
Sayaka is first seen when she moves along with her brother and her family in house. along as seen in her marnie's room and she discovers Marnie's diary in the hidden drawer in her room. Sayaka sits on her bicycle finds the missing pages from the Marnie's diary. Meanwhile when sits her room she read the missing pages from diary and open by her brother and walks on the rain and finds Anna with her fever. Leaving her bed on Oiwa's house. In outside of Oiwa's house viewing the Picture with swamp house.