You're very brave, Rin-chan.

[He sighs. There's really no way out of telling her, and a friend of Minato's should know the truth anyways.]

This world has so much negativity because most of the people in it are wishing for death. They're frustrated with all the suffering in the world, and they believe the best way to deal with it would be to start with a completely clean slate.

...I was created to grant that wish.