Because Natsu and Gray arrive in Black clover. the attack of Diamond kingdom takes place. in short. The black bulls squad went early at home by day.

'Thought'

"Speak"

"Spell"

Hidden

"An ambush attack huh?" Yami said then he looks at Natsu and Gray.

"We can help also! we are a mage and ready anytime for battles!" Gray said.

Natsu just put his hands to his back. "It's up to you. this attack on them is shaky."

"Go for it. Can you open the portal to us, Cob?"

"Sure! please take care of the attack"

the trio went in leaving Cob.

At the passageway of Clover kingdom.

"Sure they bring a lot of Army," Yami said then he looks at them. "minor the damage to the Houses. Got it?!"

"Sure! now it's time to show them my magic!" Gray said. he looks to his side and sees Natsu went in first. "Hey wait up!" Gray manages to catch up. "What's up with you? Don't ever destroy some buildings, Got that?!"

...

"Hey answer me!"

"Don't ever let them see much to your power. This isn't our territory. we are unique here who doesn't have Grimoire." Natsu creates a flame-like book to his side. "Let them confuse we had one."

Gray shock to his said.

"But I already said we don't have one. ...! okay I get it!" he creates his own as well an Ice. "Looks like I finally know your motives here, Natsu." He creates a Dual of Ice. Ice Excalibur. "You may be reverted but your still Natsu" they depart on a different path.

Natsu up on(jump to the air) and Ignite his foot holding a Creation of Scythe of Flames.

"This memory of mine. Teach by old man to make solid of flames is something. I wonder the Idiot I didn't use this thing." He saw a lot of army riding to broomstick coming towards him. "Time for experimental attack then" He flies towards them.

Natsu swings the flame of Scythe to an enemy and releases a blade of flames. Every enemy attacks him by their spell but Natsu just swings his Scythe again by side canceling their magic and burn them. "seems my new experimental move was okay it seems." The scythe disappears then he snaps his finger. A lot of Flames of thorns scattered his back appeared. "You all die to my hands! ...! no." he looks to the enemies and raise his hand and swing downwards his fingertips making the flame of thorns shooting them hitting them. "This excitement on my vines seeing them...! no. I should control this."

Someone attacks him at speed and Natsu manages to see it before it happened and dodge. "You seem to look to your death. Human." giving a vibe of killing intent. the man who attacks Natsu was Ragus, one of the Eight Shining of Diamond kingdom felt fear seeing this unknown man he attacks. Ragus went immediately backward

"Who are you! I never knew Clover kingdom had knights like you!" he said. his riding to his lighting bird creation.

"Me? I'm just a Human... or not. I'm not either Knights. ... You're attacking this kingdom. You should be afraid to your judgment." he snaps again his finger and a flame of bird-like a Phoenix summon to them. "Punish him" the Phoenix went to the enemy. Ragus were afraid of this guy and attack them desperately him but the Phoenix attack him head-on and he burns to fall to the ground.

"Every time I feel this excitement. I'm losing my will of life." He went down landing on the ground and see a guy with a black hair teenage boy looking at him. he notices a robe and Identifies it was similar to Black bulls. indicating they were Magic knights to the kingdom.

"What's wrong? I didn't kill them all... maybe?"

the boy name Yuno ask him

"what squad do you belong to?"

"hmm? Do you mean knights? I'm not a member of it. not your business anyways." he walks away. "I leave them to you"

In Gray

Gray fighting some members of other kingdoms and manage to win then he fought with Yagus. the Spatial user. his using his dual ice sword to him. this guy can control someone making Gray hard time dealing with. He doesn't have a choice and he freeze him. "That was easy."

Somewhere in around the kingdom. Yami went to Capt. Vanjence looking to them afar. Yami talks about something and requests to show his real face hidden. Yami sees his real face and thinking might be a coincidence that this guy and Litch are different people.

Back to Duo.

Natsu went to Gray.

Natsu

"You seem to have a hard time dealing with them huh."

Gray

"huh? I was using my Ice sword only."

Natsu

"I see... then what's that man in froze?"

Gray

"well, his exception. he has durability it seems."

Natsu

"That's why we should not let them see our real hidden powers."

Gray

"So your saying about the fight last day was just for observation?"

Natsu

"You got it. Your such a jerk you didn't notice it. we fought a lot to my Idiot self and You didn't notice it? ... Anyways... Don't you see this world is unique? this is the different world like Edolas like."

Gray

"Okay, now that explains. now, what's your point? Is that what you said you want to stay? how about Happy and the Guild?"

Natsu

"As I said I won't leave them but I want to stay here for a while and learn to control this hidden" pointing to himself

Gray

"I don't get it. wait! so you know how to get back?!"

Natsu sense something

"I guess we should talk another time in private."

A second later Yami arrive at them

Yami

"Congrats dealing them in easy. seem you two are useful for a while."

Natsu

"piece of cake"

Yami just glares at him and just blows his cigarette. 'His becoming darker' he thinks. (he can sense KI and Identify if that person is have something to them.)

At Black bulls HQ

"This two fought an army of Diamond kingdom? you gotta be kidding!!" Magna shock.

"They eat here a lot so it's possible to let them do some works to ours." Yami said.

"I'm so envious to you guys! I wish I can fight to them as well!" Asta said.

"The Capital is in reparations for a while. The two of you will likely be free loader here for a while. because of that. Do some house choirs. Got it?!"

"I see no problem. we indeed free loaders here and we need to do about it" Gray replied.

"Well... I leave the task to you Gray" Natsu said.

"Huh? I'm not the one free loader here dumb-ass!"

"you want me to help? do you know my house is also a mess?"

"...! you got a point. I can't let you do that. tsk! but help me atleast Cleaning."

"tsk! this isn't our work. Atleast give us some mission then. we are Mage not maids."

Yami seem insulted to this Guys and slams his fist in the table.

"Capt. Yami please calm down. we will help also" finral begging.

Everyone pleading.

"what's up with your boiled head Yami? I'm just telling the way we are. If you want to snap then go. I'm sick of pretending to be weak." He release his aura.

The two releasing their own aura and everyone is in fear.

"I will gonna END your life here" Yami said.

"Oh...? now your confident. let's see about that who will be burn to dust." Natsu said replied back to his word.

Every member of Blackbulls went to Yami hug him to stop this but yami throw them all.

'This is nuts! What happened to you, Natsu?' Gray thought.

Yami and Natsu looking to each other.

a pebble of Rocks fall and Yami dash towards him. Natsu raise his right hand fingertips and a burst of flames came from the ground Hit Yami. The Hq building starting to go melt and the burst of flames went out by the force and everyone went run by the Heat. This attack is killing. Gray can't take it anymore and freeze the area.

"Now all of what happened to you is making sense. your becoming that Monster again" Gray transforming into Devil slayer form. "And I am gonna stop you!"

Chapter 5 ends.