Demon Slayer: Kimetsu no Yaiba - The Movie: Mugen Train
This action-packed anime film continues the Demon Slayer story aboard a train haunted by a powerful demon, and it carries strong fantasy violence throughout, including bloody sword battles, body horror, and a recurring scene in which the main character must cut his own neck inside a dream to wake himself up. The emotional finale involves the death of a beloved hero and is likely to be deeply upsetting for younger viewers.
Best suited for confident teens who already watch the Demon Slayer series and are comfortable with intense animated action and grief.
If you’d rather skip
The demon Enmu traps the heroes in dreamscapes; his human minions (ordinary passengers he has bribed) attempt to destroy the heroes' spiritual cores, a concept that may unsettle younger children.
Tanjiro repeatedly cuts his own neck inside a dream in order to force himself awake; this happens multiple times in succession with visible blood spurts each time.
The demon Enmu reveals he has fused his body with the entire train; flesh and mouths sprout from the train's surfaces in an extended body-horror sequence.