Demon Slayer: The Sun-Breathing Tai Chi Swordsman

The protagonist, a manga fan, transmigrates into the world of Demon Slayer. He discovers he's a descendant of Yoriichi Tsugikuni, the 'God of Humanity'. Tsugikuni Kuuga, born with a Demon Slayer Mark, constantly feels like his life is short-lived!

Tsugikuni Kuuga suddenly realizes that his ancestor's essence - Tai Chi - is an excellent way to regulate yin and yang and strengthen the body. Thus, a Sun-Breathing Swordsman who practices Tai Chi is born.

"Sanemi, your horse stance isn't very good, squat lower!"

"Kuuga, this great me will kill you sooner or later!" Sanemi Shinazugawa said fiercely.

Tsugikuni Kuuga gazed into the distance, Muzan, wait for me to kick your little butt with Tai Chi!

Shinobu-wife, snuggle!

Main characters: Tsugikuni Kuuga, Shinobu Kocho