Ryuuji Tsurumi sat at his desk, He wasn't just a survivor Or troll of flawed plot, he was the spoiler king appointed by an higher being.
He thought of the "heroines" scattered across this messy, merged world. In the original stories, some were destined for greatness, some for heartbreak, and some for early graves.
He remembered the tears he'd shed over the final chapters of certain manga. He remembered the unfairness of a brilliant mind or a kind soul being trapped in a failing body.
"If I have the cure," Ryuuji whispered, his fingers hovering over the broadcast Dairy, "it's a sin not to share it."
He began to write. He didn't use flowery prose or complex riddles. He wrote with the urgency of a man throwing floats to the drowning girls.
[April 3rd]
[Yo. It's Nanashi again.
Today I was thinking about giving spoilers to **Kaguya-Sama** but I've changed my mind.
Last night's entry really paid off. The "System" gave me a reward called **Ripple Breathing** (or Hamon). It's a technique that uses controlled breathing to absorb energy from surroundings which is identical to the Life energy. It's not just for fighting; it's the ultimate life-hack for health.
I've been thinking about some of you who are reading this.
**Sakura Yamauchi**, I know about your falling pancreas. **Yuuki Konno**, I know about the virus in your blood and slowly killing you. **Arisu Sakayanagi**, I know your heart struggles to keep up with your intelligence. **Kaori Miyazono**, I know your body is failing you.
In the stories I remember, you guys don't have much time left. Maybe a year, or mostly two. It's not just you guys, there are probably more like you who are counting days until the final breath left your body.
I'm not okay with that.
I'm giving this technique to all of you. If you practice this breathing technique every single day, it will strengthen your cells. It will fight the disease, mend the organs, and eventually, it will fully cure you. You don't have to die for someone else's character development.
For others like—**Eriri, Kaguya, Hayasaka, Fumino, Yukino or the other girls similar to them**—listen up. I know some of you are self-conscious about being "flat." Hamon stimulates cell growth and blood flow. If you focus the energy correctly, you can actually grow your chest to the size you've always wanted. No surgeries or implants needed, just controlled regular power infusion to cells.
But a warning for the girls like **Chika** or the **Nakano Quintuplets**; You're already well-endowed. So do NOT try to overdo it. If you push too much energy there, you might end up with a K-cup or something much more ridiculous that you won't be able to walk straight. I'm not taking responsibility for your back pain!
Jokes aside, let's discuss how to Practice Ripple Breathing.
First, you have to found **The Rhythm**. You have to breathe deep into your diaphragm. It's a sharp, rhythmic intake and a controlled exhale. Think of your lungs as a bellows stoking a fire.
Next comes **Conductivity**. The energy travels best through water and living things. If you're struggling, try practicing while submerged your body in your bathtub.
It will take a while to to truly get the hang of if. Maybe a day or two, but once you get it, you will get the hang of it. Then try to use it constantly, not just the time of meditation.
Basically that's it but if you have identified someone who is also a Diary holder you can also get a **Jumpstart**. If you can't get the hang of it, you need someone to poke you hard right in the center of your solar plexus with their pinky finger while you exhale. It forces the lungs to "lock" the rhythm.
Also who can exercise your bodies, please do it. The efficiency will be much higher than a weak body and you will be able to contain much more life energy in your bodies. Now I'm not asking **Sakura, Arisu, Yuuki or Kaori to do a daily morning run**. But please do it when you overcome your circumstances. And the other girls if you want to become stronger, a strong physical body is a must.
But here is the best benifit for all of you girls, if you master this, you'll stay looking like you're in your 20s even when you're in your 60s since you will basically regenerating your old cells. It can't guarantee eternal lifespan but living past 100 is no problem.
Don't ignore this. Whether you're sick or healthy, this breathing technique is your shield in a world that's about to get very dangerous.
Good luck. We'll talk tomorrow.
—Nanashi.]
As Ryuuji closed the book, the Diary system issued the rewards, and it's was bountiful because he not only give just four dying girls a lifeline, he basically chahe the whole plot.
**[System Message: Massive Plot Deviation Detected.]**
**[Evaluation: SS+. You have attempted to overwrite the 'Fates of Death' for multiple heroines.]**
**[Calculating Reward...]**
Ryuuji fell to his knees as the data dump hit him. It wasn't just a skill this time, it was much more than that.
**[Reward: Lightbringer Template (Lucifer Morningstar - DC Comics)]**
**[Note: Adjusted for 'High School DxD' World Mechanics. Template isn't nerfed so to reach peak of the template, host need to practice. Current Synchronization: 1.00%]**
Ryuuji gasped, his hands clutching his chest. He felt a weight behind his shoulders—six pairs of silvery white wings unfuffed behind him. In the DxD world, "Lucifer" was a title held by the current Devil King, Sirzechs. But this... this was the *original* Lightbringer. The first angel made by **The Presence** the strongest and purest among all. This **Lightbringer** at his peak is more powerful than any devil ever born or present. **The uApocalypse Dragon- Great Red, Infinity Dragon- Ophis, even The Beast of Apocalypse- Trihexa** are just sidekick in front of him. Not to mention the upcoming threats like **Mechanical Gods of Evie and other Etoulde Gods**
Now even at a mere 1% synchronization, Ryuuji felt his mind expand. He could see the flow of mana in the air. He could feel the sacred light, which Once Lucifer carried before he fell.
He stood up, his movements now possessing a grace that was almost unsettling. He wasn't just a boy with a cheat anymore. He was becoming a celestial anomaly.
But it came with greater realization, the being who sent him here isn't distributing freebies, it's making him the final firewall against the odds, and he was obliged to fulfill this role or his rebirth is vain.
A soft knock at the door broke his trance.
"Oniichan? You're being quiet in there. Did you pass out from your new cult breathing technique?" Rumi stepped inside. She stopped dead when she saw him. To her eyes, Ryuuji looked the same, but the 'vibe' was entirely different. He seemed to emitt a glow—not literally, but like a masterpiece under a spotlight.
"You look... somewhat different," Rumi said, her cynicism flickering for a second. "Did you put on makeup? You look like one of those annoying idols."
Ryuuji laughed, the sound richer and more melodic than before. "Just the breathing, Rumi. I told you, it changes things."
He walked over to her and, before she could protest, he ruffed her hair gently. A tiny spark of **Lightnrinher's** Holy power passed into her. It wasn't some power up or anything—she wasn't ready for that—but it was a "Blessing."
Rumi blinked. Suddenly, she felt more at ease. The thought of the girls at school whispering behind her back didn't feel like a heavy weight anymore. It felt... insignificant. Like bugs buzzing around a mountain.
"I... I'm going," she muttered, her face turning slightly red. "Don't get weird while I'm gone."
As Rumi left, Ryuuji's expression hardened. He looked toward the window, his gaze piercing through the Chiba skyline, far toward piercing the dimensional barriers towards the underworld.
With the 'Lightbringer Template', he could feel them now. The Devils. The Fallen Angels. The people who crowned themselves as "Lucifer" and "Leviathan." In their world, power was measured in tiers. To the *original* Lightbringer, even at 1%, they were merely strong children playing house.
But he was only at 1%, just as strong as a high level Angel. If he walked into underworld now, his existence might trigger a war between Heaven, Hell, and the Grigori.
"I need to stay under the radar for a bit," he mused. "Sobu High starts in a few days. I'll use that time to synchronize with the Temple more. Let the heroines handle the breathing for now."
He looked at the diary. Somewhere in the city, **Ai Hoshino** was likely looking for a detective. In another city, **Kaguya Shinomiya** was probably staring at a leather book in shock. And in a hospital somewhere, **Sakura Yamauchi** was taking her first, deep, rhythmic breath of air full of Life energy.
The world is changing and the destiny of several girls are changing with each breath.