Zangyaku sugiru i sekai demo Suzuki wa kawaii (Associated Names)

The kind-hearted boy Suzuki was supposed to use his cheat ability to be “unconditionally loved by the local race” and enjoy a peaceful slow life in another world… or so he thought. However, due to a small mistake by a goddess, he was actually reincarnated into a bloody, end-of-the-century world where humans were being destroyed…