Classmate no Moto Idol ga, Tonikaku Kyodou Fushin nan desu.

Saegusa, who retired from idolry when she went to high school, is good-looking and intelligent. She is always cheerful and friendly, and is the most popular person at school.
Takuya, however, knows a certain side of the highbrow Miss Saegusa.
Today, too, a suspicious-looking woman in a dubious disguise appears at the convenience store...