Takuya Takei is a talented saxophonist, having even appeared on TV in the past, but for some reason, he's been hiding his abilities.

Takei practices diligently and in secret in the old school building, hidden from other students.

One day, Mari Asamiya comes to find him...

"You didn't even wipe it clean earlier...! I'll just... go wash it... wash it now... *ugh*."

With that, Mari bolts out of the music room as if fleeing.

She's a refined young lady with a half-up hairstyle, rumored to be cool, aloof, and unapproachable.

Struck by this significant contrast, Takei is both surprised and begins to take an interest in her.

Eventually, as their joint instrument practice continues, Takei's childhood friend, Eri Akeboshi, also begins to join their sessions from a different school...

This encounter with the refined young lady begins to transform Takei's world.