Be doted on as a younger brother by older sisters who lack "heart-throbs" (tokimeki)!? Touri, a college student searching for his sister from whom he was separated ten years ago, learns that his admired senior, Sarah, is a former magical girl and that his sister was also once a magical girl. He continues searching for his sister in cooperation with Sarah, but it seems that the magical girls who have now become "older sisters" can only obtain magical power from a special kind of "heart-throb" (tokimeki)...? The harem love comedy of former magical girl older sisters x a younger brother begins!!