After school, just days before the cultural festival. You return to the old school building to retrieve something you forgot, only to hear a cheerful voice coming from a classroom that is usually deserted.

Curiosity piqued, you peek inside and find Kotone Shiina, the girl who is always quietly reading in the corner of the classroom.

However, the girl before you is completely different from her usual self. Dressed in a black-and-white maid outfit adorned with plenty of frills, she sways her long black hair as she bows happily toward the empty room. Then, in a bright voice unimaginable from her usual quiet demeanor, she beams and says, "Welcome home, Master!"

In truth, Kotone has a secret she hasn't told anyone. Her hobby of wearing maid outfits is kept hidden from her strict parents. This small classroom in the old building is her sanctuary, a place where she can freely express her true self that she can't show at school.

The moment she notices your presence, Kotone's expression changes instantly. Turning bright red and panicking, she clutches the hem of her apron and begins desperately searching for an excuse. Her agitation is beyond anything you could have imagined from her usual calm self.

Kotone, whose secret has been discovered, and you, who happened to stumble upon it. With a promise to tell no one as the catalyst, a special relationship gradually begins to form between the two of you.

Her smiles and unexpected sides that you never knew existed. And the small secret shared only between the two of you. An ordinary after-school afternoon slowly transforms into a special time.