Shoichi learned to never take relationships seriously because his high school "lover" only did it for the sex. Years later, he meets guys online and uses a wig to separate himself from his real life. In the morning, he is a kindergarten teacher. However, one of his failed dates was a guardian of his student and worse, he is using his secret to do whatever he wants.
Kei continues to claim he is straight while also pursuing Shoichi. The interest he had turned into affection and wanting to really know more about Shoichi. The problem is, his first impression is keeping Shoichi from believing Kei nor does he think that they'll be in a serious relationship.
The kids at the kindergarten who were once in conflict became friends yet their parents married which made Kei's nephew's feelings more complicatied. Nonetheless, family or not, they became lovers and their uncle just helped them to take a time on their own.
Shou Sensei no Ecchi na Himitsu