Rei, whose fiancé was stolen by her sister, was summoned to another world with her sister right in the middle of their bitter confrontation.

But only her sister was summoned as the "Saint"—and I'm just an unneeded bystander...?

This is ridiculous!

Needed or not, since I'm already here, I have to survive. Dying in a ditch is absolutely out of the question!

And I won't be satisfied until I get proper revenge on my sister!

How will Rei, who isn't a Saint, wasn't specifically summoned, and isn't even a beautiful girl, survive in this other world?

And can she finally punch her sister, who stole her fiancé?