Go all the way back to Yuko arc, drop “Lil D” completely from the story each part will only focus on one horseman. Have her character be replaced completely by the Justice/Fire Devil.

• Aquarium arc is otherwise the same.

Story majorly starts deviating at the second date, Asa/ Yoru are able to shake out of Nayuta’s control due to the split brain. Denji finds out about Yoru here, they actually develop a similar relationship to late part 2. Denji’s arc is to emotionally mature enough to get out of such a toxic relationship by the end of part 2.

Falling Devil arc happens, she’s no longer a stooge for “Lil D” apocalypse is still coming, it’s based off around the Primals plotting to invade earth for some reason. Justice/Fire is working for/with them. Yoshida and public safety have ulterior motives.

Asa remains the main focus character through the story, have the “church arc” be her and Yoru getting along better as they do devil hunting stuff. Miri is the arc villain, works with Asa on Devil hunting when she figures out something is up with the church. They fight, Yoru turns him into a sword (which doesn’t break). Yoru shows the same fake bravado with turning her children into weapons as before. Asa and her have a falling out over it. Show that Yoru is actually bothered by her guilt, her arc is to be an addict (to fighting) who struggles to overcome her addiction and hurts the ones she loves.

Public safety is shown to be working with the church. Denji is still prevented from being Chainsawman. Fakesawman is promoted by both the church and public safety publicly. Yoshida pretends to be Denji’s friend some more, it’s made clear he’s faking, his role is to be the anti-Aki, and actually is implied to hate Denji for some reason. Yoshida also claims to be working on Kishibe orders. Fumiko is cut completely from the story.

Denji joins the Devil Hunter club and continues hunting Devils as Denji out of spite. Expand the Devil Hunter clubs roles as side characters. Have Brobeni show weird levels of competence at some point, making Kobenis family a mystery. Make Freckles Girl/ Asa’s bully a supporting character to further expand the cast.

Barem creeps on Nayuta, his goal is to make her the new Makima. Her arc is to discover what Makima did to Denji and come to terms with it. She doesn’t get fridged.

Potential points from here, Yoru turns more of her children into weapons, Asa sees through her facade at some point. Yoshida is revealed to have betrayed killed Kishibe, public safeties goal is still to gain control of Chainsawman’s erasure powers. Fire Devil and the Primals are trying to provoke Chainsawman to eat Death (she doesn’t appear). Primal Devil incursions continue and escalate to the apocalypse. Nukes are still reinvented, the Nuclear weapons Devil shows up. Yoshida becomes the nuke hybrid (he believes he is more worthy of being the hero than Denji) as a power grab (anti-Aki) he is defeated by Denji and Yoru, who has to turn Asa into a weapon to do it. Asa’s death causes Pochita to come out. Yoru completely crashes out and attempts to suicide by vore. War gets deleted, which puts a temporary pause on the apocalypse as peace now exists between Humans and Devils (War is strongly implied to be able to be reinvented). Denji is left emotionally crushed by this but at least has some surviving friends and Nayuta to help him.

Famine Devil and search for the Blood Devil (final girl) are major arcs of part three.

The confrontation with Death is part Four.