Hiratsuka Shizuka

Japanese name:

平塚 静

Shizuka is Hachiman's teacher, a language teacher who serves as his futures advisor/counselor and the consultant for the service club. She is aware of Hachiman's supposed "problems", and takes steps to ensure he is freed from them, her first move being to force him into joining the Service Club. However, she appears to have some quirks of her own: she is a young smoker, she is very sensitive about her age and single status, and she is often prone to quoting or copying scenes from popular shōnen manga. She also never remembers to knock before entering the Service Club's classroom, much to Yukino's chagrin. After the cultural festival incident, she tells Hachiman that helping others should not be a reason for Hachiman to hurt himself, as there are others who would feel pain seeing Hachiman hurt.

Wikipedia