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Masako Araki (荒木 雅子)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.
Manga: Chapter 143
Anime: Episode 20 (2nd Season)
(Source: Kuroko no Basuke Wikia)