The Longinus "Black Blade of the Dog God," A New Faction in the Khaos Brigade

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After exhausting the number of times he could traverse through fate, Akira returned to his original timeline.

[Ding!~]

[Toujou Sachi—Dimensional energy within her body is insufficient. Partial worldline changes have occurred!]

[Ding!~]

[Himejima Suzaku—Dimensional energy within her body is insufficient. Partial worldline changes have occurred!]

[...]

[Other worldline changes require the host to explore them personally.]

[Note: Since this time travel involved the main worldline, the host's existence in the past timeline has been preserved. Therefore, all events related to the host have been appropriately adjusted.]

After listening to the system's explanation, Akira let out a sigh of relief.

It seemed that his previous efforts to avoid interacting with his past self to prevent major disruptions to the timeline had already been taken into account by the system.

If the changes were too frequent or drastic, he would lose his connection to the past, effectively becoming a "stranger" to his own history.

Therefore, Akira didn't want to alter too many events related to his younger self.

"During this time travel, I made sure not to change any events that were directly related to me to avoid causing too much of an impact."

"Based on the new memories I've gained, my fate has remained almost entirely unchanged. Even though I altered the history of this world, my personal experiences haven't been affected."

Akira sorted through the memories in his mind, comparing the changes in the worldline he had altered with the original.

(PS: This chapter involves the main storyline related to the Dog God. If you find it hard to follow, you can skip to the summary at the end.)

[When Seekvaira was born, I didn't change any events related to her. Instead, I sought out Hayasaka Nao, who hadn't yet married at the time.]

[Based on my experience from altering Tohsaka Aoi's worldline, Hayasaka Ai would still be born, still become Hayasaka Nao's daughter, and still be raised by her. The only difference is that a new character would be created by the world's correction force to fill the role of the protagonist.]

[It wasn't until Seekvaira awakened her powers that I intervened, blessing her with a sacred cross on the day of her awakening.]

[To be precise, I granted her the protection of the 'Sacred Cross,' not the cross itself.]

[To avoid suspicion if the heroines who received the Sacred Cross ever met, I made sure the crosses took on various forms, appearing as everyday items with protective abilities.]

[Later, despite Seekvaira's excellent performance, she was still exiled by her family.]

[However, this time, unlike the original worldline, there were still many elders and younger members of the Seekvaira family who supported her. They were simply forced to remain silent due to ancient traditions.]

[Aside from Seekvaira, the main changes I made were to the storyline of the 'Fallen Dog God.']

[If Rias's storyline revolves around Issei Hyoudou as the protagonist, with the demons as the main faction, then the storyline I altered focuses on Ikuse Tobio as the protagonist, with the Fallen Angels as the main faction.]

[I didn't directly intervene in the Fallen Angels' affairs, but I subtly influenced them through the Sacred Cross.]

[The Fallen Angels, having lost interest in lust due to their high-ranking male members, gradually transformed into a research-oriented organization over time.]

[Among them, researching Sacred Gears became the primary focus of these high-ranking Fallen Angels.]

[Since most Sacred Gears are attached to humans or half-breeds, the Fallen Angels have maintained a relatively close relationship with humanity.]

[Ikuse Tobio, the protagonist of 'Fallen Dog God,' gradually established connections with the Fallen Angels while protecting his friends and fighting enemies.]

[By the time he appears in the later stages of the DxD storyline, Tobio has become a top-tier expert capable of accompanying Sirzechs to the Underworld to threaten Hades.]

[Of course, like Issei Hyoudou, Tobio had to go through many adventures and battles to reach this level of strength.]

[Like most protagonists in shonen stories, Tobio has a tragic backstory.]

[He has no family and lives alone at Reikou Academy.]

[However, unlike Issei, who starts as a loser and evolves through his desires, Tobio's story is one of camaraderie, battles, passion, and idealism—a different kind of shonen protagonist.]

[Ikuse Tobio inherited the bloodline of his grandmother, Himejima Shuba. His body houses the Longinus 'Black Blade of the Dog God,' a combination of the Greek myth of King Lycaon, who was turned into a wolf by Zeus, and the Japanese legend of the sword Ame-no-Habakiri, which slew the fire god Kagutsuchi.]

[At birth, Tobio awakened his Balance Breaker, 'Night Sky's Chaotic Blade: Dog God.' However, because he was too young and lacked the physical and mental strength to control it, his Sacred Gear was sealed by Shuba.]

[Later, Tobio's classmates went missing during a school trip, including his childhood friend Toujou Sachi. This event marked the beginning of the 'Fallen Dog God' storyline.]

[Before my time travel, my relationship with Toujou Sachi was decent, but not much deeper than Tobio's. After all, I didn't have much time to interfere with the 'Fallen Dog God' storyline, only exerting some influence.]

[However, after this time travel, I gained another avenue for increasing my favorability with the heroines.]

[This time, I didn't set the Sacred Cross to project my image when used. Instead, the users would only sense a vague presence, letting them know that the power wasn't innate but granted by someone.]

[After returning, if I reveal that it was my future self who intervened in the past, their favorability should increase significantly.]

[Toujou Sachi, a second-year student at Reikou Academy, is Tobio's neighbor and childhood friend. Their relationship is extraordinary. After Tobio's grandmother, Himejima Shuba, passed away, Sachi's parents ensured that Shuba's belongings were preserved.]

[Originally, she would have been kidnapped during the Hollow Incident on the school trip and transformed into one of the Three Beasts of Oz, the 'Lion Who Lost Its Courage,' by the Hollow organization.]

[However, thanks to my intervention, Sachi and the other students on the trip were saved, avoiding the fate of being turned into Hollows and losing their selves to become tools of war.]

[Meanwhile, Tobio, after finally coming to terms with the disappearance of his classmates, transferred to a new school to start a new life.]

[In the original worldline, he would have been attacked by monsters made from his missing classmates, known as 'Hollows.']

[Now, although he wasn't attacked by his old classmates, he still faced assaults from the Hollow organization.]

[When Tobio's life was in danger, I intervened through the Sacred Cross, saving him and telling him to join an organization called the 'Fallen Ones' in the future.]

[On the other hand, I also left a hidden hand within the 'Hollow Agency.']

[Originally, the Hollow Agency was an organization formed by exiled members of the Five Great Clans, seeking revenge on their families.]

[If the timing was right, Himejima Akeno and Seekvaira could have been recruited into the Hollow Agency.]

[In the original storyline, the Hollow Agency missed capturing the Four Fiend Sacred Gears due to the intervention of the Grigori. They then sent Hollowified Reikou Academy students and their monsters to capture the remaining Four Fiends and other Sacred Gear users.]

[However, thanks to my intervention, the Hollow Agency became desperate. Reikou Academy was a special case, and other places didn't have such a high density of experimental subjects.]

[In their desperation, I intervened at the right moment, defeated the Hollow Agency's leadership, and successfully recruited them by offering them 'Irregular Pieces' and 'Ophis's Snake.']

[After being recruited, the Hollow Agency became a faction within the Khaos Brigade, hiding in the shadows after paying a certain price.]

[Aside from the Hollow Agency, I didn't interfere much with events related to the Witches of Oz to avoid affecting Lavinia's storyline too much.]

[In the original storyline, a girl named Himejima Suzaku informed Tobio about the remnants of the Hollow Agency and the Witches of Oz. Tobio and his mentor, Baraqiel, along with Suzaku and the Five Great Clans, fought against the remnants of the Hollow Agency, the Witches of Oz, and the traitorous Fallen Angel Satanael's Abyss Team, defeating the Eastern Witch of Oz, Yastusta (wielder of the Longinus 'Incinerate Anthem: Purple Flames of Purgatory').]

[During the battle, Lavinia was controlled by Yastusta.]

[In the original worldline, I gained a lot of favorability with Lavinia through this event.]

[Now, this part of the storyline remains largely the same, except that thanks to my intervention, the battle was much easier.]

(PS: For those who skipped the Dog God-related events, here's a summary.)

[In short, the changes Akira made are as follows:]

[1: He gave the heroines Sacred Crosses in advance. This version of the Sacred Cross projects a vague image of Akira when used, preparing for when he reveals his identity in the future.]

[The heroines include: Toujou Sachi, Minagawa Natsume, Hyakki Kouyou, Lavinia Reni, Himejima Suzaku, Doumon Genbu, and others.]

[2: He recruited the Hollow Agency, making it a part of the Khaos Brigade while infiltrating the Five Great Clans to use them against the Khaos Brigade in the future.]

[3: He intervened in Hayasaka Nao's storyline, similar to how he handled Tohsaka Aoi, turning her into a surrogate mother figure. Himejima Shura's storyline will be addressed later.]

After digesting the memories, Akira let out a long sigh.

"Next, I just need to reveal to those who hold the Sacred Crosses that it was my future self who intervened in the past. That should significantly increase their favorability."

If Akira's favorability with the heroines of the Dog God storyline was originally around 60-80 (friend level), revealing the truth should push it above 80.

In Akira's room, the light of a teleportation circle flashed.

Only a few people could activate the teleportation circle in Akira's room.

The visitor was one of them.

A beautiful blonde-haired, blue-eyed woman emerged from the teleportation circle.

Her name was... Hayasaka Nao.

Due to the changes in her worldline, Hayasaka Nao now exuded a youthful charm alongside her mature, motherly demeanor.

It was the aura of a "young mother."

"Good morning, Akira-sama."

Hayasaka Nao smiled softly, glancing at the two girls lying unconscious beneath Akira.

Without saying a word, she skillfully adjusted the positions of Sona and Seekvaira.

[To think he still has them wearing Kuoh Academy uniforms... Akira-sama really is a uniform fetishist, huh?]

[But judging by how he had Sona and her Queen serve him together, it's likely that he'll do the same with Serafall and Sona in the future.]

With this conclusion, Hayasaka Nao felt reassured.

If Akira had such preferences, Serafall wouldn't be in any real danger.

After all, Serafall, the Leviathan, was still her "king." She didn't want Akira and Serafall's relationship to become too strained.

"Nao-san, have you finished handling the matter you mentioned earlier?"

Akira's gaze held a hint of inquiry.

After the worldline changed, Hayasaka Nao's experiences had also shifted.

Since she had no man in her life before, despite being influenced by her succubus bloodline and having some intimate moments with Akira, things never went beyond kissing and morning service.

Her reasoning was that she needed to resolve her relationship with Hayasaka Ai first.

Now, Akira's question was to find out her answer.

"Yes, Akira-sama. I've reached a conclusion... From now on, please take care of me."

Hayasaka Nao's gaze sharpened as she lifted her maid skirt and slowly sat down on Akira.

"Ah~"

As she settled in, both Akira and Hayasaka Nao intertwined their fingers and let out a satisfied sigh.

Note: So far this story is published up to chapter 145 on my patreon, go check it out and remember that if we reach the goal of 70 power stones I will publish the next chapter.