Houkago no Aurora

Houkago no Aurora summary:

Manaka Saki, a popular high school student, falls in love at first sight with her Chemistry teacher, Tsuge Kousuke, after being saved from insistent upperclassmen suitors. Tsuke-sensei is popular amongst the students as a teacher and a handsome man. Manaka starts pursuing Tsusge-sensei until she finally becomes his secret girlfriend. There is only one condition: both of them have promised not to touch each other until she graduates.
Will they be able to keep their promise?
This story is included in the "Pinkscrap" volume.