We're your stepsisters, but it's okay for Onii-chan to remain oblivious, you know?
The protagonist, Yuuto Otaru, has two beautiful twin sisters who are the talk of the town. Yuuri Otaru, the perfect student, and Kairi Otaru, the blonde gyaru.
One night, Yuuri and Kairi overhear their parents talking in the living room.
"The twins and Yuuto are not related by blood."
They accidentally overhear the shocking truth from their parents. The two sisters have loved their big brother, Yuuto, since they were young. Now that they've known the shocking truth, the light in their eyes is slowly changing...?
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