Yukashi Yuusha no Fukushuutan

In the Kingdom of Deltiard, when a hero dies, another will take their place, with the new hero inheriting a unique supernatural ability from God and superhuman strength. Kyrie Mynarette, a normal village girl, becomes this generation's hero, and is bestowed the seemingly useless ability to boil water. The court is alive with chatter of the "teapot hero", but the king isn't satisfied with just sending her home in embarrassment. Instead, he quietly calls for the execution of the girl and her entire village so that a new, more useful hero can be born. As Kyrie's loved ones are slaughtered around her, only then does she learn the true value of her ability as a weapon of murder and revenge...