Endo Saya

Japanese name:

遠藤 沙耶

A beautiful new transfer student in Tsubomi's school and class. She knows many things and is a friendly character. She gets along with Tsubomi from the beginning of the story and acts like a sister to her by helping her with her problems. Not only she helps Tsubomi, she even helps Daiki. She seems more mature than other children of the same age.

Wikipedia