Violence: The violence felt less intense and brutal than the first season, though there is still quite a bit of blood. Spoiler: A demon fuses with the train, and the characters have to cut through a gigantic neck bone. Also the demon has a decoy head attached to a lump of flesh, and that was kind of creepy. Characters are stabbed and one is impaled. Arms are repeatedly cut off (however, they are regenerated). Spoiler: A character repeatedly commits suicide by slashing his neck within a dream to wake up.

Sex and Nudity: None.

Theological Themes: We have the same stuff as last time, demons, demon blood arts, and breathing forms.

Problematic Themes: None.

Overall: I really, really liked it. I enjoyed it more than I enjoyed the first season. The theme of this season appears to be temptation, as various characters are shown to be tempted by the demons. I thought it was interesting to contrast Rengoku and how he handles his temptation with the passengers on the train. The ending was also very satisfying. It was sad, but it leaves you with a moral victory and the feeling that nothing was in vain.

Rengoku is very interesting. He's rather odd, but likable. In a way, he serves as a foil for Giyu Tomioka from the first season, as they have completely different views on strength and heroism. He's an unbreakable character and I admire him for that. His impact on Tanjiro is very significant. Tanjiro develops a lot over the course of this arc. Inosuke also gets some time to shine, which I appreciated, as Zenitsu and Nezuko were shafted for most of the arc.

The art was gorgeous as usual. The final fight scene was one of the prettiest, most engaging fight scenes I have ever seen. I could gush for hours about how pretty Demon Slayer is. I loved the music, too. I actually prefer the opening for the Mugen Train Arc to that of the first season.

For an age rating, I would say older teens and up still, for the violence, even though it has been toned down a tiny bit.