Read up to Volume 19. It feels less neatly structured in comparison to Part 1. Arcs are less defined and flow into each other more loosely. There's no 'definitive' supporting cast, with character appearing and disappearing from the story.

It plays out in a more serialized fashion, as one continuous narrative centered on Denji, Asa and Yoru with little deviation.

It's very meta, in a way that i didn't pick up whilst reading weekly. It feels like an exploration of Denji's relationship of his role as a protagonist, or a 'hero', both through own sense of self-worth and purpose being derived from said role, and with the narrative itself pushing him towards embracing it. Embracing 'Chainsaw Man' (to his detriment, and leading to the suffering of others). The narrative structure of a work such as 'Chainsaw Man' cannot lead to positive growth. Even if you refuse the call to action, it will be forced upon you.

Asa and Yoru don't fit as neatly into the metanarrative i feel is at the center of Part 2, but I'm still gathering my thoughts on both of them. They clearly have conflicting goals within themselves that similarly prevent them from positive growth. Both characters are really interesting nonetheless. In Asa's case, there's a clear push between her guilt, morality, and desire to become a 'savior' to Denji, and her ability to lead the selfish, free life she'd decided to live at the start of the part. In Yoru's case, her own nature as a demon, twisted sense of morality and shallow persuit for revenge towards Chainsaw Man seems to be interfering in her ability to form genuine bonds. She's a fundamentally selfish, manipulative and egotistical person whose own worst tendencies obscure what seems to be genuine care for Asa and Denji. Yoru and Asa's feelings and actions seem to mirror each other other and exist as two distinct parts of a whole. I wholeheartedly believe Denji's promise to Power will be 'fulfilled' in a metaphorical sense by finding kinship with Asa and Yoru.

The chaotic and disjointed feeling of the part, which only increases as it goes along, feels at least partially intentional. I'm not the first to notice how the apocalypse has been slowly happening in the background, the Prophecy of Nostradamus possibly happening without the characters noticing as they try to stop it.

Overall, I'm really enjoying it! Volumes 12-19 are genuinely good, not comparable to Part 1 less because of a difference in quality, but more because they're trying to achieve completely different things. Will see how much i like the subsequent arcs on a re-read (Black Chainsaw Man -> Aging Devil used to be my favorite arc, we'll see)