My sister-in-law became a hero.

One day out of the blue, I got caught up in my sister-in-law's mess and was summoned to another world. The moment we arrived, someone asked, "Where is the Hero?" I immediately judged it to be troublesome and without hesitation pointed at my younger sister-in-law. "It's this person." "Big sister, that's so mean!" What's mean about it? Who else but you, blessed by the gods with beautiful appearance, brilliant intellect, and athletic prowess, could be the "Hero"?... Anyway, it seemed like a hassle, so I'm out. Here begins the lazy sister-in-law's unconventional otherworldly adventure—the story of an utterly perfect superhuman girl and her apathetic older sister. (※Note: The protagonist is virtually invincible from the very beginning.)