Kiraware Majo wa Eiyuu ni Aisareru

Original Webtoon
The witch Nigrau stood on the brink of death. Beside her was the hero Astor, holding a sword.
"Is it my fate as a witch (to be hated and killed? There's no way I'm going to die like this!"
When Nigrau woke up, a newborn baby was crying next to her.
The baby was Astor, the hero destined to kill Nigrau.
Astor had traveled back in time to when he was a baby!
Swayed by the baby's cuteness, Nigrau decided to raise it, as it would be no fun to kill it now...!?