The Girl Does Not Love the Witch

Do you know how to kill a witch? Burning at the stake won't work. Because they can easily extinguish the fire with magic. Drowning won't work either. Because if they turn into a fish, they can breathe, right? So you're saying torture would do it? No way. We'd be killed by their magic before we could even start. In the first place, only another witch can kill a witch. A mere human can't kill one. Even if you pierce their heart, it will automatically regenerate. So how do you kill them, you ask? I'd like to tell you to figure it out yourself, but I'll teach you. Because surely there will come a day when it becomes useful. The method to kill a witch is simple, really. Truly very simple. So what is this method? It's this――