Demon Slayer: The Ice Blade in the Dead of Winter

A boy who had everything taken from him by demons picks up a sword and seeks revenge, wielding his family's ancestral Ice Breathing. The moment he takes up the blade, it's clear that another prodigy has been born. "The protagonist does not transmigrate. He is born with the Transparent World, and will unlock his mark and crimson blade relatively early. Pairing: Shinobu Kocho. A happy ending for everyone."