A teacher at Fujigaya Girls' Academy, her alma mater.
Yamashina is the home room teacher of Akira and Ryouko. She is the subject of classroom gossip, as a handful of students claim that she's in a relationship with another woman. Akira overhears them talking about Yamashina-sensei and starts feeling upset when she realises that the other students are not only slandering their teacher but also condemning those in same-sex relationships. Ryouko seems to find the classroom gossip unsavoury and tasteless as well.
She knows Oono Haruka personally as she is close to Haruka's older sister Oono Orie.
In several flashback segments, it is revealed that Hinako does in fact like women as her students speculate. She had a crush on Orie in high school, and tried on several occasions to give her a love letter (the very same letter that Haruka finds years later while cleaning out her sister's old bedroom).
Hinako is also linked to the Sugimoto sisters as she worked alongside Sugimoto Kazusa as teachers in Fujigaya and went to school during the same time as Sugimoto Shinako.
Vova
