In the previous episode: Keima wakes up on Saturday morning and, at Cupid's urging, agrees to have a training fight with Diana. Keima takes advantage of the situation to make peace with Tenri, and the two make peace. In the afternoon Keima is attacked by Dark Heart who tries to kill him, and clarifies why he has to correct the Dimensions: he is forced by the New Hell. Dark Heart deals Keima a fatal blow, but a strong light ends the fight.

In this episode: Keima awakens to find that he has switched bodies with Dark Heart. The latter now goes for a walk with Keima's body, and tries to make trouble.

"But what happened? - Keima woke up on the roof of a building in Narusawa City.

"Partner! Catastrophe! Alarm!" - began to scream Cupid, in his mind.

"Cupid, one thing at a time, please."

"Look at yourself in the mirror." - Keima saw fragments of a broken mirror. He picked one up and, after looking at himself in the mirror, he screamed.

"I..." - reflected in the mirror was not his body, but that of the person he had faced last night.

"Exact! You and Dark Heart switched bodies!" - shouted Cupid at him.

****THE WORLD GOD ONLY KNOW SERIES!****

*Keima finds himself in a body that is not his. When Keima discovers Dark Heart's past as he hatches a new plan to get rid of Keima.*

KIRAKIRA kagayaku doma ni boku-ra wa meguriatta to omou kara Kizutsuki migakiage. (I think we met to shine even brighter. So let's clear away the doubts.)

THE WORLD GOD ONLY KNOW! GOD ARRIVAL!

Mada masshiro na Sekai wo suberi hajimeta sen doko reso mo ikeru ki ga shita! (I've just started slipping through the lines of this empty world, and I feel like I can go anywhere!)

Dokidoki no Imajin ga Enjin yume wo egaku kedo Soto no sekai hamidasenai mamma! (Our heart-pounding imagination is our engine! As I try to find my way around this new world!)

Jitsu wa motto mawari no me wa ki ni sezu ni (Sometimes, you shouldn't listen to what other people think of you.)

Sakebidashitai, hashiridashitai, so! Kanjita nara Kirame-Go! (You just wanna scream and run, so when you hear it, it's time to go!)

Mirai ga hajimaru kaze wo tsukande jōshō Kikari Kiramentaru! (The future is beginning, so catch the wind, with a sudden flash of brilliance!)

Suki na koto wo shinjiru chikara. (This is the power of believing in the one you love.)

Kirakira kagayaku doma ni bokura wa meguriatta to omou kara Kizutsuki migakiage. (I think we met to shine even brighter. So let's clear away the doubts.)

THE WORLD GOD ONLY KNOW! GOD ARRIVAL!

Keima's mind exploded. This thing had already happened when he had to capture Yui's Inferno soul. The soul was so powerful that it had made sure that the bodies of the two interlocutors exchanged.

"No! Does not exist! Not again!" Keima began to panic.

"Partner, keep calm. Don't panic." - Cupid tried to calm Keima, but the echo of a shrill bell interrupted him.

Keima took the phone out of his pocket and read the name of the person who was phoning: "Director Skull?"

"Um… Ok, let's panic…" - concluded Cupid.

"Hello?" Keima asked in a faint voice.

"Hey! Dimensions Manager, Ryushi Sakari!" - Keima felt the scream of the leader of the New Hell reverberating in his head.

"Yes, Dokuro Skull-San?" Keima told him in a panicked voice.

"Yes, a horn! - the Demon began to yell - May we know what you did yesterday afternoon?! You said Keima Katsuragi would be as good as dead by now!"

"But Director Skull, you don't understand..." - Keima tried to explain.

"Oh, I totally understand. And I'll also tell you one thing: if you don't eliminate Keima Katsuragi, you will never leave this Dimension again, and thus you will never see your family again!" - threatened him Skull.

"But I want to review my position!" - answered Keima quickly, who had become accustomed to the position of the character.

"Oh sure. Fix all the Dimensions first, and then we'll talk about it. Never forget who your master is. So, either fix Keima Katsuragi in no time, or I'll send you a team of infernals that will put an end to both you and Katsuragi. I've been clear?"

"Crystalline!" Keima confirmed.

"Then get back to work!" - and the call ended abruptly.

"Partner! We are in trouble! We need to track down Dark Heart before…"

"Head of Dimensions, Ryushi Sakari?" - the real name of Dark Heart echoed in Keima's head who, after having listened to the conversation, remained there, still and motionless, contemplating the infinite.

****A year ago… Size RS06…****

Ryushi Sakari had just returned home after a day's work. His parents hadn't returned yet. First, he turned on his computer and began accessing his personal site, where he found the latest video games for free. The magical power of having your knowledge in the world of video games, and having the knowledge of a professional hacker. Ryushi sighed. He was depressed. Not even playing his World of Magic consoled him. It could have had everything a person wanted in items. Whether it was a car, whether it was a video game, whether it was whatever he wanted. He was desperate. He had no one to connect with. The reality was complicated. Ryushi, at the age of 10, spoke 6 languages, solved complex equations, was the absolute genius of science. As a result, the government of his city had enrolled him in the most prestigious university they had. Unfortunately his life was a mess. He was always teased by his classmates, even 5 years older than him, ignored by girls of his own age, because he was considered a laughingstock, and even those of his age didn't consider him. Ryushi felt sorry for this and tried to find friends in the world of video games. Already at his age he had become an electronics professor and every time a colleague of his discovered his past, and his current age, he quit instantly and changed schools. He hated his life, he hated his intelligence, he hated his life as an intelligent person, and he longed for a life as an ordinary person. Because he didn't want to be the king of the world in order to change anything. He also preferred to read manga and knew all the clichéd situations by heart. Each manga, for him, was a new world that needed to be discovered. An email arrived that day. Thinking it was a usual job offer, he opened it anyway and read a strange thing: (Dear Ryushi Sakari. We know about your story as a genius and we want to offer you a unique opportunity! Saving the world without the need to be known too much! If you want to know more this offer, press the accept button. If not, press the decline button, and the email will be deleted forever. Dokuro Skull.)

"Um… Sounds interesting. Saving the world, without needing to be known too much. Dad and mom will be thrilled. I accept! - Ryushi's computer screen lit up white - What the…" - a black collar was attached to Ryushi's neck and everything got dark. He woke up a few hours later, in a room like his.

"Was it a dream? he asked himself as he got out of bed. He went to open the door but his eyes widened in unpleasant surprise. Outside the door, there was a space that appeared to be made of multicolored fluorescent matter. - What the hell…" - the door closed by itself.

(Registration complete. Welcome Ryushi Sakari, Head of Dimensions!)

"EEEHHH?! Where am I?! Who are you?!"

(My name is Dimensio. I'm an AI from the New Hell.)

"Okay, the joke is good when it's short. You better tell me who you are, why you kidnapped me, and you better let me go."

(I repeat once again that I am Dimensio, an A.I. of the New Hell. And you have not been abducted. You have just signed a contract with the New Hell. From today you will be the new head of the Dimensions.)

"Size?" Ryushi examined the collar on his neck, and tried to take it off.

(Let me introduce you to all the things you need to do. The whole world is made up of Dimensions. Dimensions are universes that are separate from ours but coexist with ours. Some are even different due to the space-time continuum. You are the responsible for the Dimensions, and for all the Multiverse.)

"I see, take me back to my Dimension!"

(Time that is not possible.)

"What?"

(The New Hell has placed a seal in your dimension, which reacts to the collar on your neck right now. You will never go back to your Dimension, with the collar on.)

"I do not believe you!"

(Very good, then we'll try it soon. Coordinates for Dimension RS06, set! Portal activation!) - the door in front of Ryushi opened, and showed his Dimension.

Ryushi tried to pass, but a force field skillfully pushed him away: "No! No! Cancel all! I want to go back home!"

(His contract will only be fulfilled when he finishes correcting every single Dimension.)

"How many Dimensions are there?"

(Billions of Dimensions.)

"Billions?!" - yelled Ryushi.

"However, not all of them are full of mistakes. So, it's going to be about a hundred." Dimensio reassured him.

"Do I have to fix them all?!" - Ryushi despaired.

(Affirmative!)

"I want to talk to your boss!" - threatened Ryushi.

A screen appeared above Ryushi: (Call in progress…)

A short guy, covered by a black cloak, and with a white, skull-shaped mask on his face, was projected onto the screen: "I am Dokuro Skull. I welcome you to the Dimensional Squad."

"Dimensional Squad?" - Ryushi didn't understand.

"The New Hell is concerned with preserving several things: humanity, the Dimensions, the universe, and the future itself. And you were singled out for your talents and situation."

"My situation?"

"You are a person who often hits and misses places. I know that when your fellow professors find out about your little secret, you instantly quit and disappear from sight. You are perfect for the task."

"OK well. I would like to cancel the contract."

"This is impossible."

"What?!"

"Canceling a contract is only possible when the mission is accomplished, there are a few exceptions and you are not one of them."

"I refuse!"

"Your refusal means only your own condemnation. You'll be in here all your life if you don't do your job, whether you like it or not. Each of us in the New Hell does our job, whether we want to or not. And my job is to assign tasks, and enforce tasks. And I like. See you."

"HEY! What are you saying?! Talk to me! No one has ever slammed the phone in my face, you filthy sewer rat!" Ryushi started shouting.

(If he wants to revise his Dimension, he'd better do his job.)

"And how do I do this?"

(It's very easy. First, you must examine a Dimension, and learn its history, which will be engraved in its memory. Second, it must decide how to resolve the matter: whether to help the character peacefully, or whether to kill him.)

"Kill? I would never do that!"

(Believe me, there are people who deserve to die.)

"And how should I do?"

Gloves materialized in front of Ryushi, with built-in claws, and a purple sword_ (These are your weapons. Kiritsuke Mist Claws and Kiriken Mist Sword. You will use them for your own good and pleasure.)

Ryushi took, and put on, the infernal weapons: "I expected, for the greater good. But it does not matter."

(By the way I prepared a costume for her.) - Ryushi's room closet opened and revealed a black mask, with glass goggles, and a night black cloak.

Ryushi put them on: "Comfortable, except the mask."

(It's up to you whether you wear it or not.)

Ryushi put on the mask: "I'm ready."

****Present…****

Keima awoke from the vision with Cupid yelling in his ear, "Partner, Partner? Keima?! Earth calls Keima, Partner of the God Cupid!"

"Don't scream in my ear, Cupid! And then, how did you keep your original shape? This is not my body!" - in fact, Cupid still looked like Keima's twin brother, with blond hair and blue eyes.

"Because it's my base Skin. I have adapted to your body and, even if you change your appearance, I don't change, except by my will." - explained Cupid, as he took out his PFP.

"Did you see it?" Keima asked him.

"See what?" - asked Cupid, starting to look from all sides.

"Dark Heart's past. Indeed, - Keima corrected himself. - Ryushi Sakari."

"Yes. And I woke up five minutes before you."

"This plot is too forced! Why choose an ordinary mortal, and not a trained Devil, as Head of Dimensions?!" Keima tried to understand.

"Staff shortage. - supposed Cupid - At the time you were all busy, including you, hunting for infernal spirits, and then my little sisters also arrived, many things happened, you were released from your contract, you had a bad ending, after three months we met, you proposed the final harem, and here we are, in a body that is not in ours."

"It seems to me that there is a slight leap forward in your story." Keima said, annoyed.

"Just because I summed up quickly." - Cupid justified himself.

"And now what do we do with this new mess?!" Keima asked Cupid.

"With this mess… What are we going to do?" - asked Cupid.

"Cupid…" - Keima began to despair.

"I was joking. I've already found the solution!" - rejoiced the God of Love.

"Tell me!" Keima insisted.

"In Heaven, even frequently, body exchanges take place between the Angels, and this is the method for the exchange…" - Cupid whispered something to Keima.

"Do you think it will work?" - Keima asked him, hopeful.

"Maybe, but it's worth a try."

"Then we go! - Keima took out his PFP, but… - Where are my CDs?" - Keima asked, starting to look like crazy in the pockets of Ryushi's body.

"Sorry, Partner, I forgot that you won't be able to access your powers until you return to your original body." - apologized Cupid.

"What? Why?!" - Keima asked, even more panicked.

"Why?! - Cupid began to say, as if it were obvious. - Because if I make this body use the powers, then I will be bound to it."

"What about my devil powers?" Keima asked, hoping for an alternative.

"You can merge two powers into one, by fusion. But I advise against it because, probably, you would lose yours, since you have decided to transfer your devil powers into this body." - finally explained Cupid.

"Ugh… I can't use my powers, both angelic and demonic, I can't use my Skin Change, because I don't have access to the vault, and I can't use Fusion Mode, or Super God Mode!" Keima lamented.

"Relax, we just have to take the enemy by surprise…" - Cupid reassured him.

****Katsuragi House…****

Dark Heart was furious. But how the hell had he managed to switch bodies with his target?! Never, never in his career, barely a year, had he had such an experience. He wasn't too sex-swapped, because the person he'd body-swapped with was another male, but he didn't like that the person he'd had to body-swap with was the person he'd have to eliminate in order to succeed in his task, were it his body. And now what was he supposed to do?! Commit suicide? No, he would have killed Keima's body, not his soul, and then he would have killed his soul, and he would have died! He would then have to switch again with Keima, but if he had done it, Keima could have been alert again, worse than before, and would not have let him even get close, and he would have had to face ranged combat, in which he was not very expert. While leaving the house, with this riddle in mind, Ryushi Sakari tried to find a solution, while passing through the city center: "Of course! If I can't destroy the problem, I have to fix the problem. But this time I will eliminate the secondary causes! Allow me an explanation, without having to sing! - Ryushi raised Keima's glasses, while putting on a serious face. - A dimensional problem can be solved in two ways: either the problem is eliminated or it is corrected. Since it's impossible for me to kill the problem of this size, I have to fix it. But I certainly can't correct the personality of the main character, since the person I have to correct owns my body, so I have to give up correcting the root cause. The primary cause, in this Dimension, is the change in Keima Katsuragi's behavior from wanting nothing to do with reality, and with love, to behavior that faces reality, and endures it to protect the people, who he says he loves. The change in his personality is due to a series of secondary causes, in this case the people Keima Katsuragi wants to protect, and with whom he has to fall in love. Furthermore, during the fusion he made with that God, Cupid, the latter's character merged with Keima, and therefore influenced his character, which already gave alarming signs of improvement in the past. The solution is only one! Eliminate secondary causes! And since I can't get rid of the God, then I'll have to get rid of the girls. But I can't make Keima commit murders he never committed; the dimensional anomaly would create a paradox that would destroy this Dimension. Yes, I have no other choice, I have to eliminate the girls, but without Keima killing them! - Ryushi heard a noise coming from the bushes. - Who is there?!" he asked, pulling away slightly.

"Ki Ah!" - Keima popped out from a bush and head-butted Ryushi, who made both of them fall to the ground, with headaches.

"What the fuck are you doing?!" - growled Ryushi, getting up from the ground, and rubbing his aching head.

Keima struggled to his feet: "Cupid told me that I could switch sides with you by headbutting you. That's how it works in Heaven…" - but Keima saw that the method hadn't given the hoped-for results, being still in Ryushi Sakari's body.

"Gullible naive! Do you think that useless God of yours knows how we switched bodies?" - Ryushi asked him, as he began to argue animatedly.

"Of course not, but I have a hypothesis. Your final blow is to blame! - said Keima, pointing to his own body, commanded by Ryushi. - We activated a sort of Skin Change that swapped our bodies." - Keima made a gesture to adjust his glasses, but failed, because Ryushi wasn't wearing them.

"Look, it didn't take a genius to understand that. 90% already figured it out!" - compared Ryushi.

"Okay, but now stand still, please. I know how it feels, you will only feel a slight pinch, and then Hell!" - Keima equated, as he unsheathed Ryushi's sword, and tried to strike him.

But he skillfully dodged and took refuge on a pole: "If you were mad!"

"Go down!" Keima ordered him.

"See you!" - Ryushi told him, starting to jump from pole to pole.

"HEY!" - Keima jumped, but tripped over Ryushi's cloak, and fell to the ground like a sack of potatoes.

****Hours later… Roof of Narusawa City…****

"That cursed!" Keima began to curse.

"Partner, we have to do something!" - apostrophized Cupid.

"And what?! I can't address the Guests of the goddesses, or Elsie or anyone! I can't use my powers, or Skin Change, or anything! I am finished!" - Keima despaired.

"Of course! I know who to look for!" - began to exult Cupid.

"Oh yes? Who are we to look for?" Keima asked, waiting for Cupid's idea.

"We must seek help in the New Hell." - Cupid said it quickly, to avoid regretting his own words.

Keima's gaze darkened, so that you could see the pupils of Ryushi's body's eyes turning black and without irises, but then Keima reacted: "WHAT?! No! No! No infinity!" Keima began to shout from the rooftops.

"Member!" - Cupid tried to take him back.

"No Cupid! This time it's not!" Keima decided.

"Partner, I understand the difficulty, - Cupid understood - but we must intervene, even at the cost of collaborating with whoever we consider enemies. Not that they're real enemies, but..."

"Aren't they real enemies?! They made me their slave! And now they want to kill me!" - growled Keima, full of resentment.

"I know! But the other option would be to collaborate with the Old Hell. Which of the two is the lesser evil? Indeed, which of the two is the more reliable?" - asked Cupid.

"Both sides are parasitic worms out of rotten apples!" Keima insulted them.

"Partner, please! Give it a try! And I won't even choose the person you want to collaborate with." - tried again, Cupid.

"Fuck both Hells, then! There is none worth their salt in either!" persisted Keima.

"Keima, you're really pissing me off! Cupid began to yell. He was no longer a Partner, he was Keima, in these important situations. - Do I have to remind you of the danger looming by the Guests of the goddesses, or will you realize it when you go to cry on their graves?! You heard Ryushi said, he has to eliminate the secondary causes, and he can't eliminate me, on whom he can ever pour his fury. If it does anything to your conquests, then my little sisters are affected too. You have no choice!"

Keima gave up, slamming his fist on a wall: "So, there is a person. Yes, I have no other choice. It is perhaps the only one that is valid both in standard characters and in skills. I have to find her!"

"I'll locate her! Tell me his name!" - Cupid told him.

"His name is…"

NEXT STEP! FLAGS. 291!

KEIMA: "I never imagined having to collaborate with you."

?: "Me neither, Keima."

Keima finds the person who could help him make things right!

KEIMA: "This time I will decide when to dissolve our alliance!"

?: "Done deal!"

AN OLD KNOWLEDGE!

RYUSHI: "Let the plan begin! I will ship them to Dimension Z!"

Author's Note: Things get interesting. Keima has exchanged bodies, this time with Dark Heart, or rather with Ryushi Sakari. He can't use his powers, and must ask the New Hell for help. And Ryushi, now in Keima's body, wants to kill the secondary causes, but without killing them himself. What will happen in this story?! Stay alert too! Commenting and activating notifications! We will see each other!