Gyarukano! ~Wagamama Body na Honpou Kanojo~

The main character and Kazuyori are two lovers who by pure chance start dating.
Their hobbies and tastes are completely opposite, but they get along very well and spend their days enjoying each other's company.
However, the protagonist has a bit of a problem.
Kazuyori was cheerful, kind to everyone and generous, but at the same time relaxed and defenseless.
She liked to dress brightly, and often her underwear was visible.
When her classmates saw her and pointed it out, she simply guffawed.

Thinking back on it, he struggles to figure out what that feeling was and how to express it...