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I think the issue here is that you’re applying an extremely strict standard to “souls” while allowing extremely broad interpretations for “purely conceptual/metaphysical biology.”"Contracts can take lifespan, senses, body parts, memories" - these can be explained biologically if we assume contracts are strictly metaphysical with no soul interpretation left to use then it becomes - "lifespan" - the biological process of human degradation, "senses" - simply signals in the brain the contract targets, "body parts" are targeted by contracts metaphysically souls aren't in the equation. "memories" - brain shenanigans a metaphysical contract targets. "It is metaphysical identity/body binding" - does mind control require a soul? "sound of Chainsaw Man’s engine" - it's strange but that's more like instinctual reactions if anything or conceptual persistence unrelated to souls.
You could have an abstract existence without necessarily needing a soul. "Nayuta being the Control Devil after Makima also shows identity can continue through rebirth even if memories/personality reset." - what identity does nayuta retain from makima?
"CSM does not say “humans have no soul.” It just does not explain souls directly." correct they don't explicitly say it but I feel like it's evident because humans and devil interactions are strictly conceptual. "That is already enough to argue they have some metaphysical self Yuji..." NO actually it is not because when we agree souls and metaphysics / conceptual things are different you then need to actually argue how yuji's soul attacks are broad enough to affect conceptual things outright but if you argue that then Yuji's attacks aren't really soul-based anymore and are just general conceptual hax at that point.
It's hard to explain but the spiritual attacks are one form of haxs that needs to interact with a thing that interacts to the spiritual haxs in the first place when something lacks that then naturally the hax wouldn't work. "It does not prove Denji resisted soul damage or poison" - true I was simply arguing that if Yuji's attacks did work on Denji specifically the soul damage then Pochita would come out. I wasn't arguing that denji "resisted soul damage or poison" in that instance since I was being charitable to your position by granting it completely.
Also no just because souls aren't defined doesn't mean that we can then assume souls exist in CSM. When soul damage starts affecting metaphysical concepts at that point its not soul damage anymore. The best analogy here is think of contracts and everything else as literal laws.
Like yes, in theory you can explain lifespan, senses, memories, etc through “metaphysical laws acting on biology.” But that is still fundamentally a non-physical layer interacting with a person’s existence. At that point the distinction between “soul,” “essence,” “metaphysical self,” or “conceptual identity” becomes mostly semantic in crossverse debating unless the series explicitly hard-denies one of them.
And CSM never does that.
You keep saying “contracts are conceptual laws,” but those laws still target individual existence. They recognize identity, ownership, lifespan, consciousness, memory, intent, promises, and selfhood. That is already far beyond normal biology. A literal biological robot framework would not meaningfully explain why contracts care about intent, agreement, sacrifice value, or identity continuity.
Also, saying “mind control doesn’t require a soul” is true, but that misses the point. The argument was never “contracts prove souls directly.” The argument is that CSM consistently acknowledges non-physical identity structures tied to beings beyond raw flesh. That weakens the claim that humans in CSM are purely material entities with no compatible inner-self for soul interaction.
And on Nayuta/Makima:
No, Nayuta does not retain Makima’s memories or personality, but she does retain the existence/role of the Control Devil. That is still identity persistence at a metaphysical level. The entity dies and reincarnates while maintaining the same fundamental existential classification. That is exactly why Kishibe immediately recognized Nayuta as the reincarnation of the Control Devil in the first place.
As for the engine sound point, calling it “instinctual” honestly doesn’t solve the issue either because instincts persisting across death/reincarnation is already evidence of non-physical continuity. Whether you call that spiritual, metaphysical, conceptual, or existential inheritance, it still demonstrates persistence beyond ordinary biology.
The main disagreement though is here:
"Yuji would need to affect conceptual things outright.”
No, not necessarily. Soul attacks in fiction do not require the target verse to define souls identically. Crossverse debating works off functional interaction. If a verse has:
- persistent identity,
- non-physical existence,
- metaphysical continuity,
- reincarnation,
- consciousness interaction,
- contracts binding selfhood/existence,
then there is already enough there for soul interaction arguments unless the verse explicitly shows immunity or incompatibility.
Otherwise you run into absurd conclusions where characters from verses that never explicitly use the word “soul” become immune to all soul manipulation by default despite clearly having metaphysical existence systems.
And honestly, your “literal laws” analogy kind of hurts your own point a bit. Laws still govern something. If contracts are metaphysical laws acting on a being’s existence, then there is already an underlying metaphysical existence being interacted with. Yuji’s attacks do not need to suddenly become “general conceptual hax” for that interaction to work.
Especially because JJK itself distinguishes body and soul as connected but separate layers of existence. Mahito’s entire technique revolves around that distinction. Yuji damaging Mahito proves Yuji can interact with that deeper layer. Crossverse equalization then asks: “does the other verse possess an equivalent deeper existence/identity layer?” CSM pretty clearly does.
You do not need CSM humans to have a Christian-style immortal soul for Yuji’s soul interaction to function. You just need them to possess a metaphysical self/identity layer beyond raw biology, and CSM repeatedly shows that they do.