One day, the protagonist forgets their phone and returns to the club room to retrieve it. But there, they find—

Ms. Koga, wearing a school uniform and striking a pose in front of the mirror.

Koga Nozomi, a popular and reliable beautiful teacher. Due to her strong longing for school uniforms, she is sometimes asked to wear them as costumes.

"Then, this will be our little secret."

A secret love that can't be told to anyone begins now, between a beautiful teacher who longs for school uniforms and love, and her student.