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The Intro Arc is the first arc of Chainsaw Man manga series.

Pochita and Denji
A young Denji meets the chainsaw devil, Pochita, finding him bleeding out and near death. Denji chooses to save the devil by allowing him to drink his blood, forming a contract with Pochita stating "I'll save you... so you save me.". Denji, using Pochita as a weapon goes on to become a mafia-hired devil hunter as a way to pay off his father's debt. The two go on to continue this for years, a strong bond forming between them through it.

Denji's Rebirth
One day Denji and Pochita are lured into a trap set by the Zombie Devil, which had manipulated and taken over the members of the mob in which Denji was hired under. The two are killed, chopped up, and thrown into a dumpster, Pochita however coming back to life as a small trickle of blood from Denji's decapitated head falls down into his mouth.

Denji awakes in a sort of dream sequence, laying down on his back with Pochita laying upon his chest. Here Pochita tells Denji that he loved hearing him talk about his dreams, before stating that he was making a contract with him, where he would become his heart in return for Denji "showing him his dreams".

Pochita merges with Denji, his body reforming and regenerating, with Denji reawakening in the dumpster, his scars gone and with Pochita's cord now coming out of his chest. The Zombie Devil takes notice of Denji, the zombified mob beginning to charge at him as he thinks about his dreams, coming to the conclusion that the zombies were in the way of that as he pulls on his cord, turning him into a chainsaw hybrid as he charges into the zombies.

He tears through the mob with his chainsaws, the Zombie Devil showing confusion and asking if Denji was now "one of them" as Denji lunged at him, punching an arm through his eye before splitting him in half vertically. He proceeds to kill the rest of the zombies, proudly exclaiming that his debt would be gone if he killed them all.

Enter, Makima
A woman and two guards step into the building where the Zombie Devil had been, finding a chainsaw hybrid Denji standing amongst the slaughtered remains of the zombies. The woman, Makima, steps forwards towards him, stating that he had a smell that wasn't human or devil before asking him "Did you do this?".

Denji mutters out a request for Makima to hold him as he starts to fall forwards, Makima wrapping her arms around his waist as he reverts back to his human form. Makima tells Denji that she was a public safety devil hunter and that she had originally come to kill the Zombie Devil, and that he had two choices: To be killed by her as a devil, or to be kept by her as a human. She also states that if he picked the latter, she would give him food.

Denji proceeds to ask what he would get to eat for breakfast, with Makima replying that he would get bread with butter and jam, salad, coffee, and possibly desert. Denji exclaims that it was a "dream come true", choosing to be kept by her as a human.

Characters Introduced

 * Denji
 * Pochita
 * Tomato Devil
 * Zombie Devil
 * Makima
 * Muscle Devil
 * Aki Hayakawa
 * Power

Chapters

 * 01. Chapter 1
 * 02. Chapter 2
 * 03. Chapter 3
 * 04. Chapter 4