Houkago no Aurora

A high school student named Saki Manaka develops a romantic interest in her Chemistry teacher, Kousuke Tsuge, after he intervenes when she is approached by persistent older students. Tsuge is admired by students for his teaching and appearance. Manaka begins to pursue him and eventually becomes his secret girlfriend. They agree to a condition: they will not be physically intimate until she finishes school. The story explores whether they can honor this agreement.