After catching the student council president's killer dodgeball, Chojusen effectively won the game for Rias. As Rias and her peerage were celebrating the victory, Chojusen made his way over to the student council side and started to fix their clothes. Creation Magic was extremely rare, so Chojusen's act of goodwill made him friends with these other devils.
When he finished repairing the student council members' clothes he helped Rias, Akeno, and Koneko; for some odd reason, Kiba didn't get his clothes blasted to pieces… As Chojusen fixed Akeno's school uniform, she looked at him with ever more passion; her desire to learn creation magic made her practically cling on to Chojusen.
The last thing Chojusen fixed were the remnants of the devils' battle. He then left with Asia to go back to his house. On the way home, Asia boldly asked if she could learn Chojusen's creation magic; at least in her opinion learning the divine skill of creation was a bold request. Chojusen saw no problems with teaching her the Armament Creation Skill. After all, her Chaosfiend bloodline would make it very easy for her to learn Yin and Yang Skills.
Asai had more talent for magic than Chojusen credited, as it only took Asia three attempts at manipulating Demonic Yang and Holy Yin energy to create basic materials like steel and iron. By the time they reached their home, Asia could create whatever she imagined and it wouldn't be damaged except for Mid Class Devils or above.
For the next couple days, Chojusen and Asia went to school like normal teenagers. Chojusen would spend some time after school discussing magic principles with Akeno, Asia, and Rias. He would also spar barehanded with Koneko. After Kiba learned that Chojusen was a grandmaster staff wielder, he also got excited to improve his sword mastery while fighting an armed Chojusen.
In these days of carefree training, Chojusen bonded Rias and her peerage to the point where he would consider them good friends. When the day of the full moon came, Chojusen and Asia were escorted by Rias to the Pet Dimension. Much to Chojusen's surprise he found that to get there, they had to literally travel through dimensions.
This wasn't like his home universe where there was one complete dimension and several dimensions created by others. No, after Chojusen did some probing with his space magic, he could clearly feel the existence of several dimensions.
When Rias and company reached the Pet Dimension they encountered a weird middle-age-looking man who tried to dress like a hipster. The man called himself the "Pet Master," and he showed Chojusen and Asia around to see if any familiars caught their interest.
Chojusen directly pulled Chokogo out of his personal dimension and said "I don't need a familiar."
The Pet Master said "Mhmm? A butterfly?" He closely observed Chokogo and jumped back with fear after seeing the grey stripes on her body. He said "F-F-Fiendgod?"
Chojusen said "That's right! You're more reliable than you look..."
Rias had never heard that term before. She asked "Fiendgod? What is a Fiendgod?"
The Pet Master first kowtowed to Chokogo three times and said "My mistake!!! She isn't just a Fiendgod… This butterfly as a goddess amongst Fiendgods! I can die happily knowing that I've seen a Fiendgod Empress before dying."
Chokogo was getting uncomfortable having this weirdo kowtow towards her while completely ignoring her master. She said "Uh… It's fine. Stop that… it's weird..."
"Thank you!" The Pet Master then turned to Rias and said "Fiendgods were ancient gods of legend that were hunted to extinction for being too strong. The only reason they died out was because they were severely outnumber when all the pantheons made an alliance to get rid of them as a race." There was still fear in the Pet Masters voice as he narrated the history of Fiendgods.
Chokogo went back to Chojusen's side and fell asleep on his shoulder. The Pet Master then realized what kind monster Chojusen had to be, to have a Fiendgod Empress be subservient to him, and looked at him with horror. Rias and company couldn't really feel the gravity of the situation as Chokogo acted how she did, and chose to not show off her Fiendgod aura.
After that little episode with Chokogo, the Pet Master began to walk around the Pet Dimension in an effort to help Asia get her own familiar.
The pet master showed Asia a variety of monsters including lesser and greater youkais, ghosts, mermaids, snakes, and birds. However, none of the monsters had affinity with Asia, so she could only continue on the walk across the Pet Dimension.
At one point, a slime-like creature rained down from the sky and covered everyone in its goo. Chojusen watched with amusement as the slime monster started eating away at the girls clothes, but completely ignored him, Kiba, and the Pet Master. The Pet Master explained that this monster was practically useless and could only do what it did now; eat away at womens clothes.
Chojusen felt a bit bad for the girls as they were helpless with the slime covering them and corroding their clothes, so he used a bit of Wind Elemental Creation to blow away the smile from destroying the last few pieces of string that covered the girls' bodies. He then repaired what was left of their clothes. His lack of lust and nonchalant attitude when dealing with several beauties exposed in front of him made the girls appreciate him more, but also feel down; like they weren't women that could ruin countries with just their looks.
As Chojusen was completing the repairing process of Asia's clothes, a small blue baby dragon came out of nowhere and tried to shock Chojusen with a weak stream of demonic thunder. Chojusen didn't have to do anything as the thunder generated by the baby dragon could barely tickle his skin.
As Chojusen was preparing to punish this dragon for trying to sneak attack him, the Pet Master said "A Sprite Dragon! Wow those are super rare and it looks like it wants to be with Asia."
However, right after the Pet Master finished his sentence another greyish-black dragon came out of the void and swiped the Sprite Dragon away with its tail. This new dragon then mercilessly bullied the Sprite Dragon for a couple seconds before running to Chojusen as if it was looking for approval.
"C-Cha-Chaos..." The Pet Master was hyperventilating and couldn't get his words across.
Chojusen looked at this new dragon with approval and said "Very nice… If I'm not mistaken this little dragon has an incomplete fragment of the Chaosfiend lineage?"
"R-right!" The Pet Master was almost going insane. Today he had seen two creatures with some of the strongest bloodlines, thought to be extinct. The Chaosfiends were even rarer, as there had only been one such existence ever recorded in books; an existence so powerful, it had to die of old age before the Biblical God would dare show his face to this universe's factions.
Chojusen looked at the dragon for a second and said "You want to be my familiar?" the dragon nodded, hoping Chojusen would agree to let it be his servant; that way it could potentially evolve into a complete Chaosfiend in the future after maturing.
Chojusen shook his head and said "Sorry, but I already have a familiar." He pointed at sleeping Chokogo on his shoulder. As the black dragon was sneering at Chokogo for daring to steal the best candidate to be its master, it visibly shuddered as it detected the Fiendgod aura coming off her body.
Chojusen then grabbed Asia and stimulated her bloodline. Just as the Black Dragon was about to go back into the void, it detected Asia's aura and begged her with pitiful eyes to take him as her familiar. It thought that it would have to wait for millions of years before finding a worthwhile partner, after Chojusen declined its request. Now, Asia was a beacon of hope that the Dragon would do anything to contract with.
Of course, Asia agreed to have the Black Dragon be her familiar, and after completing the contracting ceremony, she named him Raikuro. With Raikuro by her side, Asia would be very hard to harm as Raikuro could travel through dimension and if the need ever arrived, he could take Asia with him temporarily.
Now that Asia contracted a familiar and the purpose for going to the Pet Dimension was over with, it was time to go back. However, Chojusen didn't want to wait of the transdimensional train to come pick them up, so he just teleported everyone back to Occult Research club after he had all of them hold hands.
After discovering that there were several complete dimensions in this higher universe, the system's map started mapping out the Dimensional Stage World Map. With Chojusen's teleportation, as long as he had been to a place once, he could return with the coordinates provided by the system.
His act of teleporting through dimensions was extremely shocking to Rias as she knew from reading her Clan's records that only god-level figures could achieve that feat. But, Chojusen explained that it wasn't the real deal and that he could only teleport to places he had been to. It was still extremely impressive regardless of the conditions, so Rias' astonishment didn't dim at all.