“Nice ta meetcha—♪” …She sounds kinda dumb!
The good first impression—Wow, she’s pretty—shattered in an instant.
Thanks to his father’s remarriage, Kota suddenly finds himself with a new stepsister: an ultra-cheeky, totally modern gyaru girl!?
While their parents are away, a hellish new life begins as he’s thrown completely off balance by Aika’s free-spirited, anything-goes lifestyle…
To their parents, she’s a “good girl.”
In private, she’s a total mess.
Aika is an annoying, complicated stepsister right in the middle of her rebellious teenage phase.
And the unlucky one who gets stuck with her is Kota—a nitpicky, argumentative guy through and through.
Whenever they’re together, it’s nothing but nonstop insults and verbal abuse—
the worst sibling relationship imaginable is born!?
But maybe it’s just his nature as an older brother…
As Kota keeps looking out for her despite everything, Aika slowly starts to see him in a different light…!?