Adult Teacher wa Osuki?

A high school student named Yuhi begins a relationship with his attractive math teacher, Watari, but finds that their connection is limited to physical intimacy. Yuhi is puzzled by Watari's indifference toward emotional romance. Meanwhile, other students face their own romantic challenges: a shorter partner feels insecure with his much taller lover, a grumpy individual struggles to ask someone out, a cat-boy deals with affection during a heat cycle, and a childhood friendship turns into a romantic misunderstanding.