Tenka had been watching Yuuki fight while she had been dealing with the swarm of Shuuki witnessing him slice cleanly through them and found his moment to be quite strange and difficult to predict like shadow. She could somehow make out purple darkness appeared as he swung his blade showing that his technique was more than meets the eye.
She assessed that fighting him would make her doubt and question her chances of winning. Tenka has been an honor student from childhood, never failing in anything. She was never interested in boys her age, and lived life in boredom whenever alone, even after becoming a member of the Anti-Demon Corps. Yuuki seems like something that has a different impression from the other boys she met.
Tenka was astonished when he stood beside her storing his sword and took a stance cocking his fist behind him gathering force staring down towards their enemy. His expression was still yet brimming with emotion focusing on one thought.
"D-Damn you, Obsolete!"
Then Rairen appeared and spits out several fireballs. Tenka dodge it as she also took Yuuki with the help of her peach blessing and appears right beside him.
Tenka Peach Blessing Ame-No-Mitori After receiving the Peach Blessing, Tenka has attained the power to control space itself, letting her teleport from one location to another seemingly without limit, but needs to touch the person she intends to teleport with her. Rairen tries to attack, but Tenka dodges and creates a large vortex nearby him.
"Try to keep up."
Rairen stepped back from the attack only for Yuuki to appeared inches away from him until he suddenly felt powerful consecutive impact strike his sturdy body.
[ Full Contact Karate - Ballistic Fist combo ]
The force ripples into his solid flesh caused it to crack from the immense forces and baffled that he was able to wound him this much.
'What the!? How did he manage to injure me!?'
He saw his face unfazed and still looking at him like he was too weak then gritted his teeth and quickly retaliated.
"You think this is enough to defeat me!"
Rairen fist headed towards Yuuki only for their fist collided with one another canceling the impact while sending a wave of aftershock into the hair. The two then went at it, going for a slugfest where Tenka didn't try to interrupt their fight, feeling something warning her not to.

'Each of their attacks seems enough to incapacitate me if I get hit and yet Yuuki is taking it, no, he's overwhelming the shuuki.'
Tenka was impressed at the strength he was displaying and Yuuki felt his heart pounding from the excitement where he was hit by Rairen several times but he was also countering and started to break his solid body that Rairen couldn't believe it.
'I, Rairen, one of the Eight Thunder Gods being overwhelmed by an Obsolete!? I refused this outcome!'
Rairen grew frustrated that he was on the losing side while Yuuki hardly showed off slowing down and the humanoid Shuuki gathered his strength into his fist charging it with lightning and said.
"This is the end, Obsolete! Die!"
Tenka was about to step forward to help only for Yuuki gestured to stop her then felt his demeanor change seemingly manifesting a face of an Oni as he was hit by the lightning blast where it turned the ground to ash.
"Hahahaha this is the fate of you, Mongrels!! Turning to ash. You can never defeat me!"
Rairen shouted looking at the dust cloud laughing non stop only for his whole body to tense up finding red glowing eyes peering through the dust and Yuuki began to laugh where Tenka shocked to hear him act differently than his usual demeanor turning into Wild beast. He was burned yet his wound was healing itself and his skin was growing back.
"Hahaha, this is simply amazing! My chest is pounding and my body aching!! This is what it feels to be alive!! Show me more, Rairen was it?"
Rairen couldn't believe that he suddenly felt the urge to step back upon seeing his expression. This is a state like [ Ultra Instinct ] where the feeling of self hatred and inferiority rushing turning into hysteria.
He has based this from lookism since they were the closest thing he could take inspiration in fighting and manage to replicate in his previous life. This causes Yuuki to increase his power to increase even more utilizing the best of his capabilities.
"Let me reward you for hurting me."
Yuuki showed a vicious smile as he took deep breaths then vanished from his spot appearing in front of Rairen grabbed his face and slammed his face on the ground while dragging him and Rairen struggled to escape from his grasp where he was on top of him holding his face showing a wild grin.
"You said you were going to kill us? Then do it! Kill me!!"
Rairen gritted his teeth, then summoned gathering lightning into his fist before striking Yuuki, sending flying several feet while he stood back up.
"You are obsolete!! I am a superior being!! I am a god!!!"
Yuuki stopped his momentum dragging his feet on the ground as it dug into it before stopping turning his attention back to Rairen.
"Then it means you never struggle and learn to grow. This makes you weak!! If I am a mongrel and obsolete then what makes you?"
Rairen's anger grew even more as Yuuki saw that he was getting stronger from his taunt and this made the fight more enjoyable but he knew that keeping this up would ruin his fun in the future and glanced at Tenka having already had his fill in fighting Rairen. She saw this and was surprised his expression returned and quickly acted once more, appearing behind Rairen and successfully hitting him, halting his power up.
"Agh You little—Huh?!"
Rairen is surprised to find they are in mid-air and were far from his original position.
'She instantly teleported me with just one hit'
Rairen thought to himself while Tenka teleports back to the ground and looks at Yuuki.
"The placement is perfect Slave-Kun"(Tenka)
"Thanks."(Yuuki)
Yuuki vanished from his spot appearing close to Rairen where his legs were over his head where the humanoid Shuuki couldn't even react as he spun around and his feet slamming into his face.
[ Renewal Taekwondo - Axe kick! ]
The force pushed the air around them and slammed Rairen into the ground with immense forces that formed a giant crater. Rairen couldn't move anymore struggling to even breath where Yuuki stood on top of him looking down at the self proclaimed god.
"Impressive Slave-Kun you're full of surprise."
Tenka appeared close by next to him where Yuuki pinned Rairen into the ground.
"Yeah, what can I say I'm quite the mystery box. But for now, do you want to tell us where your friends are?"
Yuuki wasn't smiling as he stopped his crazy state for moment since his not fighting anymore and Rairen gritted his teeth glaring at them
"N-Never."
Rairen tried to produce a fire breath only for Yuuki's feet to slam into the ground and break his jaw while Yuuki's face covered in shadow where only his red eyes peered through and grabbed his arms gripping it tightly enough to crack his metallic hand as he screamed in pain and anger from the humiliation he was being put through.
"Wrong answer."
Yuuki then ripped both Rairen's arms off as he screamed in pain where blood gushed out from the stump where Yuuki held the arms looking at it then stored it into his inventory while Tenka a big surprised at his brutal action and before they could finish the job, a black liquid was under Reiren, Yuuki jumped back then Reiren Disappeared.
"They escaped…."
He purposely let them have plans on fighting him again a lot stronger than before to enjoy his fight.
"I can't seem to teleport where they are…."
Tenka tried to use her powers but something was blocking her. She then turned his attention to Yuuki who deeply exhaled and removed his [ Ultra Instinct ] state calming his body.
"That aside, you did great, Slave-Kun. How do you feel after all that?" (Tenka)
"It was enjoyable, though, hope I didn't scare yah from my crazy state."( Yuuki )
He turned to face her and place his hands on his hips while Tenka merely smiled at his question.
"I wasn't and found it interesting. But we can discuss later, let's meet with the others first."
Yuuki nodded and after a while , all members of the 6th and 7th Units and Ginna gathered outside, having eliminated all enemies.
"We've looked everywhere but it seems the area is clear of enemies."(Yuuki)
"But Nei Reported that there were more high ranking enemies Left"(Kyouka)
"Weren't they all defeated with Yuuki's Awesome attack?"(Shushu)
She went to Yuuki hugged his arms and enthusiastically praised their attack getting patted by Yuuki treating it as her reward while Tenka saw this seem to start desiring him to be her own.
Tenka Isn't the type to give up that easily seeing this while Himari is also somewhat jealous but recalled that she will have to reward him with Kyouka and blushes at the thought of it. She still feel embarrassed about it but started to enjoy them with only problem that she will have Kyouka's help in rewarding him
"There were some pretty strange enemies."(Tenka)
"I'm sorry everyone despite my clairvoyance. By the time I discovered them It was too late."
Nei was ashamed of herself for not being able to inform them while Kyouka and Tenka quickly console her and reassure her that she did all she could considering the enemy's capabilities.
"You did your best but our enemy is different. That's why it's already amazing you manage to detect them, Nei-chan."
Yuuki reassured her, making Nei smile at words and receive a pat on the head as reward.
"Making a report of this is going to be a difficult task."(Kyouka)
"That's true, let's call off the matches and accept it as a draw."(Tenka)
She then turned his attention to Yuuki.
"Slave-Kun, you also did a good job today."
"Thanks But I couldn't have done it without your help."
It was true since he was able to restrain himself from ending the fight too quickly as he wanted to enjoy it and grow more powerful. Tenka smiled at this feeling, her heart fluttering after seeing his sincere and honest smile.
"Yuuki, Please gimme your autograph."
Ginna arrive with a board and pen with her eyes sparkling
"Me?"(Yuuki)
"Seems you got yourself a fan."(Tenka)
Yuuki signed the board that made Ginna squeal at this and he awkwardly smiled then turned to Himari who was walking towards Yachiho.
"Hey."(Himari)
"What do you want"(Yachiho)
"thank you so much for before."(Himari)
Yachiho vigorously replies that she only did so to preserve the Azuma Family's good and asks once more if Himari will come home with her again but ends up Refusing again and turning Yachiho into stone then wa spick by Sahara like sock of potato.
"Well we're heading back soon."(Tenka)
"See Ya~!"(Sahara)
They wave their goodbyes while Tenka takes one last look at Yuuki before they return to their base and Ginna heads back to the 10th unit while Yuuki stretches after they left having been sore from the fight but certainly grown stronger.
"It's Been a long day, time to take a bath."
Later, inside the 7th Unit dorm, Himari indignantly begins to strip along with Kyouka as Shushu wanted to join but decided to have her own later in his room.
"Is this my reward?"
Yuuki teases them a bit causing Himari to blush even though she was hoping for this since she likes him giving her hickey on her neck but was embarrassed since Kyouka was with them and doesn't know the strange relationship that she has with her.
"This is what you want isn't it."
Himari remarked, it was more denial than a complaint while Kyouka began to strip, removing her coat flustered at her action.
"This is so indecent."
Himari was tsundere through and through with Yuuki enjoying it since he got the chance to tease her.
'Still too proud to admit huh?'(Yuuki)
"We did defeat a Lot of enemies together after all."( Kyouka)