Life.2: The being a High-class devil and harem king's dreams are difficult.
Part 1
After meeting up with Rias and the others at the park, we transported the mysterious group of Devils to an association of experts in the Underworld via a magic circle, and then returned to the Hyoudou residence. We also reported the current situation to the Underworld's government through the House of Gremory as well. My comrades, as well as the Gremory peerage, gathered in the living room on the first floor of the Hyoudou residence. We often used this living room for discussion as it became pretty spacious when the Hyoudou residence was reconstructed into a nine-storey building. Rias looked at everyone as she said.
"About the Devils that attacked Ise...as expected, they're the [Unknown Devils]. Such was the report I received from Ajuka-sama's servant."
—.
I see, so they had even come to this town...! Everyone turned grim in response to those words. I said.
"If I'm not mistaken, it was the incident where the Devils with completely unknown origins started appearing everywhere in the Underworld, right?"
Indeed, currently, the unidentified Devils had been appearing in the Underworld and causing trouble everywhere. It became something that even the Underworld was unable to ignore. Even after they were caught, we still had no idea who those guys were. Unlike in the past, ordinary Devils in the Underworld now had an ID created for them. For the nobles — in the Underworld where a strong class society still existed, it was important for them to have something to prove their own identity. Nonetheless, nobody from the [Unknown Devils] that had been caught disturbing the Underworld tried to show any proof of their status or identity. It's really easy to think that the old Devils and their grandchildren that had been living in the outskirts of the Underworld suddenly decided to revolt against the current government. The group of mysterious Devils that attacked me were these [Unknown Devils]. Rossweisse-san said as she pondered.
"They have been appearing in the territory of other mythologies too, and now they're at Kuoh Town..."
...This situation, it's certainly not something delightful. To think that the incident in the Underworld is also happening to the human world, and of all places, it was in the city that we live... Xenovia took a lamented breath.
"Even though the barrier here is quite durable, for not only the Grim Reapers, but also the mysterious Devils to pass through it..."
The 'Grim Reapers' Xenovia was talking about were exactly like the legends, those who hunted living souls. Under the lower layers of the Underworld where Devils and Fallen Angels lived, there was a certain territory called the Netherworld, which was ruled by one of the three pillar Gods of Greek Mythology, Hades. It was the place where they screened dead souls. I heard that it's an uninhabitable place because of the harsh environment. And those who worked for the leader of the Netherworld, Hades, were called the Grim Reapers. We had a bad relationship with them as there had been times when we fought. It was because Hades had an objection with the idea of every mythology making peace with each other. And so, the Grim Reapers snuck into Kuoh town and attacked us a few days ago. I didn't know how they managed to pass through the barriers, but...it surely was a threat. Ravel said.
"To begin with, the barrier was something that researchers from every mythology had thought of..."
Rossweisse continued.
"I also took part in that project as well, and...I can confidently say that it's not something that a normal Devil could break."
Ever since Rossweisse-san joined us as a comrade, she had been conducting research on defense and barrier-related magic, and she had become quite skilled in the area. Ah, demonic power and magic were two different things. Demonic power was a superpower that Devils possessed since their birth. The analysis of a Devil's demonic power and the miracles created by God to recreate them through their own theory and formula was called magic. One could also say that it was a technique of creating a supernatural phenomenon. Starting from Rossweisse-san, there were also many of my comrades who were learning magic. As the topic of Grim Reapers was out, Rias said.

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True High School DxD
RomanceA continuation from where High School DxD Volume 25 left off. ―○●○― I, Hyoudou Issei, am a 2nd Year High school student and my age is equal to the number of years I haven't had a girlfriend. And, someone like me got a girlfriend! I'm sorry buddies...