Masako Araki (荒木 雅子 Araki Masako) is the coach of Yōsen High.

Some time before the current timeline, Araki was a successful youth basketball player. She even made it as far as a regular on the national Japanese female basketball team. She was acquainted with the male team, which consisted of Kagetora, Takeuchi, Nakatani, Harasawa and Shirogane.

First Appearance
Manga: Chapter 143
Anime: Episode 20 (2nd Season)

(Source: Kuroko no Basuke Wikia)