Youko Sasakura

The school art teacher and an old friend of Itoko, who was her junior during their college years. On several occasions, it is hinted that she and Itoko are more than just friends, although this has never been confirmed outright. It has also been hinted that she is a lesbian and has always been trying to get closer to Itoko during their high school years. She seems to know (and share) an important part of Itoko's past, and though not deliberately, has used this against Itoko to gain favours or company a few times. She has very good driving skills.

(Source: Wikipedia)