Reborn In DxD As Rias Gremory With Rimuru’s Overpowered Powers

"Here we go!" Came from the voice of a young female Devil.

This young Devil is none other than the Crimson-Haired Ruin Princess, Rias Gremory of the House of Gremory. However, she's not a normal version of the original Rias. No, she's a soul who has memories of her past life that was reincarnated as Rias. Also this is not her first, second nor even fiftieth time being reincarnated or transmigrated.

So it wasn't much of a shock when she found herself once being reincarnated. Though this is her first time being reincarnated in the DxD universe period. She was extremely happy that she reincarnated as Rias in this universe, since Rias had been her favorite female character and one of her overall favorite characters in the original story of High School DxD. Whether she was living the life of a male or a female during the time, the love for Rias stayed true.

Essentially she was a simp for Rias whether she was a male or female.

Contrary to the popular belief or expectations of most cultured webnovel readers or general isekai fans, a golden finger is not always guaranteed for a reincarnated or transmigrated soul.

Rias can recall that in several of her past lives, she did not receive a golden finger. Luckily more times than not, she did receive one. Just like she did in this new life of hers in the DxD universe.

Anyways, there is another reason why Rias isn't a normal version of herself and it has to do with her golden finger.

While she wasn't granted anything extravagant such as a system or anything like that, which she is truly grateful for since she didn't want one in the first place. What the young devil did receive is the soul, body and powers of Rimuru Tempest at his peak evolution Ultimate Slime.

Meaning Rias isn't only a reincarnated soul reborn as a pure-blooded Devil. She's also a slime and True Dragon from the tensura universe.

Thankfully her current soul is completely fused with Rimuru's, otherwise there's no way she would be alive right now, let alone handling Rimuru's powers or skills.

At the same time, she instantly realized that she's too powerful for the DxD universe.

Back to the current situation, as the successor to the Chaos Creator. Rias wanted to briefly cause a chaotic commotion in the Underworld.

The young crimson-haired Devil cupped her hands together before charging up her magicules to form a red energy sphere.

As a Devil, Slime and True Dragon, Rias can use both demonic power and magicules. She can convert her magicules into demonic energy and her demonic energy into magicules thanks to the help of her Manas partner, Ciel-Sensei.

"Ka…me…ha…me…" Rias felt her inner otaku screaming in excitement.

As pathetic as it sounds, as many times as she's been reincarnated, this is her first time trying this legendary move.

Off on the sideline causally floating in the air with her wings in Grayfia Lucifuge. Her face is stoic as usual, however mentally she could only sigh at what her chaotic sister-in-law is about to do. Honestly this is pretty much a normal occurrence for the members of the House of Gremory.

Most if not all of them know how chaotic the very overpowered young heiress can be. It's a blessing that Rias chooses to only let herself go on a rampage in either the pits or numerous wild forests of the underworld. Nowhere near the territories of the Devils, Fallen Angels or even Hades.

Truthfully when she originally began accompanying Rias on these trips, it was from the request of both Lord and Lady Gremory in order to have someone watch over the young heiress. Grayfia, the dutifully maid she is, of course accepted. She learned quickly after the third time that Rias is more than capable enough of handling herself on her own without supervision.

Grayfia did inform Venelana and Zeoticus, but this time it was Rias who requested Grayfia to still accompany her on their weekly trips to random forests.

It's been a few years since then, due to the amount of time spent together the bond between sister-in-laws grew and deepened greatly.

"HAAAA!!!!" Rias shouted as she fired a powerful red wave of energy towards a monstrous size mountain.

Grayfia was slightly shocked by the amount of power that had been compressed into the attack. She watched as it destroyed not only the intended targeted mountain but also the land and many trees behind it.

Once Rias' Kamehameha wave ended, several more large mountains had been destroyed.

The head maid said to herself. "That move of hers had more than enough power to wipe out a mid-tier Ultimate Class Devil and gravely injure a high-tier Ultimate Class Devil. It's amazing that she can causally fire off such attacks constantly without even looking anywhere close to being somewhat tired. And to think she's still only 8 years old….Rias-sama…you truly are something else.' She shook her head.

"Shall we return now Rias-sama? We've been gone for several hours already." Grayfia asked in a polite tone.

"Hmm sure." Rias shrugged. "Hey Grayfia…do you want to spar the next time you have some free time?"

The silver-haired maid immediately replied. "I'm afraid I will have to decline your offer Rias-sama."

"Aw, don't be like that Grayf-"

"Rias-sama." Grayfia gave her young sister-in-law a narrowed gaze.

"Ok, ok, no need to give me that cold look Grayfia-nee." Rias held her hands up in defeat.

The young crimson-haired Devil went a little overboard last time she fought Grayfia.

"Thank you for your understanding, Rias-sama." Grayfia softened her gaze and bowed slightly.

"Ugh, I wish you stopped doing that. We're sisters, you don't need to bow." Rias rolled her eyes.

"Even so, it's my duty as the head maid to always show you proper respect and decorum." Grayfia countered easily.

Not wanting to go argue about this conversation again, Rias just let it go and changed into her cute crimson slime form. She hopped up and landed in Grayfia's awaiting arms.

While she's gotten used to it. It still baffles Grayfia quite a bit that Rias, a pure-blooded Devil, is somehow both a slime and True Dragon. Something that should be impossible.

Although she and Venelana both agreed that they do enjoy holding Rias in her slime form.

Grayfia teleported them back to the Gremory mansion.