This summer, Kota, a boy who moved from the city, was a target of bullying in this town where outsiders stood out.
However, he had one ally.
“What were you guys doing to my precious Kota?”
Her name was Ayano.
A strong and kind older sister who was always by his side.
She was still young, but to Kota, she was far more of an “adult.”

Just having Ayano by his side made Kota happy.
Meanwhile, the bullies were troubled by the sudden appearance of this “adult.”
Would they no longer be able to bully Kota…?
In the midst of this atmosphere, Takamichi, the leader, spoke up.
“But, you know, she had big boobs, didn’t she?”
His words made his friends swallow hard.
The bullies were a bunch of perverts, even more so than adults.
And to think that that sexy “adult” is on the side of cowardly Kota…
“So, if we use Kota… hehehehehe”
– Poor Kotahas no way of knowing their scheme.