Based on the anime series Kimetsu no Yaiba, Nezuko is the sister of Tanjiro. After their family is slaughtered by demons, Nezuko survives, but she gradually starts turning into a demon. Her brother always tries to prevent her from becoming a demon, even going as far as having to engage in sexual acts with his sister to stop the demon transformation and bring back her human nature.
The film features a fantastic cosplay by idol Mitsuki Nagisa, which will please idols who want to indulge in the Nezuko image :)).
For those who haven't seen this anime, you can search for Kimetsu no Yaiba on Google; it’s a must-watch masterpiece that you shouldn’t miss if you often watch Japanese anime.