F ew anime characters seem as invincible as Inosuke Hashibira from Demon Slayer: Kimetsu no Yaiba. From his reckless fighting ...

Despite freeing himself of the curse caused by the demon entity, he still perishes. It further demonstrates that death is inevitable if the Smile demon has come for you. Even if Joel had lived ...

While it is true that Shinobu doesn't express a lot of her rage and disdain for demons, her smile is not meant to hide anything but rather to honor her sister and fulfill what she asked her.