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Dungeoneering in One-Punch Man

Juan_Piece
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Synopsis
Aomori, who possesses a Monster Slaying System, arrives in the world of One-Punch Man and gains the ability to enter various Dungeons. Consequently, titles such as: "Founder of the Hero Association," "Hero Rank No. 1," "The Ultimate Hottie," "Scourge of Evil," "God of Pure Love Battles," "God Slayer," "Savior," and "Lord of the Myriad Worlds" were all bestowed upon him. This is a Multiverse Crossover story, with One-Punch Man as the main world. Dungeons include: Pokémon, Demon Slayer: Kimetsu no Yaiba, Sword Art Online, Baki, Dragon Ball, Jujutsu Kaisen, Is It Wrong to Try to Pick Up Girls in a Dungeon? (DanMachi), Dragon Quest: The Adventure of Dai, Digimon, Inuyasha, Re:Zero - Starting Life in Another World, No Game No Life, Yu-Gi-Oh!, Naruto, One Piece, Bleach, Akame ga Kill!, That Time I Got Reincarnated as a Slime, So I'm a Spider, So What?, and many, many more.
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Chapter 1 - The System

It was 4:00 AM, and the world was utterly silent.

Aomori, sleeping on a two-meter-twenty large bed, slowly opened his eyes.

Ding!

[Congratulations to Player Aomori for completing the achievement: Waking up due to one's own handsomeness for three consecutive months, earning the title the 'Ultimate Hottie'. Equipping Effect: Charm +5. Do you wish to equip it?]

"No."

Compared to Charm +5, the currently equipped title, "A Small-Time Novice", with its effect of All Attributes +1, was more suitable for him right now.

Aomori quickly flipped out of bed, folded his blanket into a neat cube, glanced at his perfect reflection in the full-length mirror, a face that increasingly resembled his memory of himself, and turned into the washroom.

After a quick rinse and brush, he changed into his sportswear and running shoes and headed out.

Five minutes later, Aomori arrived at a nearby small grove and began his daily training routine.

100 Push-ups, 100 Sit-ups, 100 Squats, plus a 10-kilometer run—Aomori had maintained this regimen without fail since he transmigrated to this world three months ago.

In the beginning, it was incredibly painful. Aomori relied on his intense thirst for power to persevere, but now it had become a habit; he felt restless if he didn't complete it.

The results of the training were delightful; his Attribute Points shot up, but the rate of increase slowed down the further he progressed. At the same time, he was becoming less satisfied with the current intensity of the training.

Fortunately, Aomori had the System.

The Monster Slaying System was the name Aomori gave the system he carried. He could gain Experience and Points by killing non-human creatures. These Points could then be used to open Treasure Chests and draw various wondrous items and skills.

For example:

[Name: Heavy Training Gi Set (Blue) (Equipped)]

[Description: From Dragon Ball. The training uniform worn by young Son Goku during his travels. Equipping this increases Experience gained by 10% and Training Effect by 10%.]

[Remark: "Wait a second, I need to take off my clothes."]

The Heavy Training Gi Set included the top, wristbands, and shoes. Aomori chose to hide its appearance and constantly wear it, taking many days just to barely adjust to it.

Training became even more difficult. After just twenty push-ups, he was sweating profusely and completely exhausted.

Whenever this happened, Aomori would raise his hand, and a flash of holy light would fall upon him. The pores all over his body instantly relaxed, making him feel so relieved he almost let out a moan.

"Mmm~"

[Name: Lesser Healing Spell (Blue)]

[Description: Skill Card. Learnable. From Hearthstone. Using this on a target heals minor injuries, relieves severe injuries, restores stamina, and alleviates fatigue.]

[Remark: "Wow! Amazing! Thank you!"]

With his stamina restored, Aomori immediately threw himself back into his training.

Cycling through this process, Aomori completed his daily training goals around 7:00 AM. Dragging his tired body back home for a hot shower was the usual morning routine at the Aomori residence.

Only today, things were slightly different.

Ding-dong! Ding-dong!

Aomori, who had just finished showering, frowned slightly. He changed into his casual clothes and opened the door.

"You're slow, Aomori, you..." Standing outside the door was an elegant woman with black hair and red lips, dressed in a sharp business suit. Her words trailed off halfway as she stared at Aomori, her eyes overflowing with visible adoration.

His damp, choppy black hair, his hazy dark eyes softened by the steam, and droplets of water running down his forehead, tracing his perfectly sculpted features and desirable collarbones, before disappearing into the mysterious regions beyond.

"Got a shot of freshly-bathed Aomori! I'm dying!"

Aomori was accustomed to the reaction. He leaned against the doorframe and asked, "Miss Fujiwara, may I ask what you need?"

Two months ago, Aomori's outstanding looks caught the eye of a talent scout he "incidentally" met. Within a month of his debut, he released two albums, every song becoming wildly popular. He quickly soared to fame, becoming a household name. This Miss Fujiwara was his agent.

"Slurp!" Miss Fujiwara was a professional after all. She wiped the corner of her mouth and quickly returned to her composed appearance. She grabbed Aomori's arm and urgently said, "There's no time! Get in the car first, I'll explain on the way!"

However, Miss Fujiwara couldn't budge Aomori, even with all her might.

Looking at the expressionless Aomori, Miss Fujiwara cleared her throat and said, "There's a very important audition today! It's for the lead roles in Director Edwards' new work! Aomori! It's the Director Edwards! The world-famous director who has won countless awards! As long as you can star in his work, you will absolutely skyrocket to become a superstar!"

Miss Fujiwara gesticulated wildly, practically wishing she could just poof Aomori right in front of Director Edwards.

"Miss Fujiwara, we already agreed when we signed the contract: I will not take on acting roles. I only accept singing, dancing, and idol-type work."

Aomori currently had only one goal: to become stronger, stronger than everyone else!

Hmm... at the very least, he had to be above all living beings, right under the bald one.

Therefore, Aomori would not accept work like acting, which consumed too much time. Absolutely not!

"But this is a once-in-a-lifetime opportunity! Aomori, you have a lot of hope!" Miss Fujiwara persisted.

"There's no need to say more. I won't agree." Aomori turned around, preparing to go back inside.

"How could you?" Miss Fujiwara admitted defeat, hanging her head dejectedly. "The investor said last night that if Aomori were the male lead, they'd be willing to offer a 200 million salary..."

200 million? Aomori's ears twitched, and his raised foot instantly froze.

....

In the speeding car, the driver was the overjoyed Miss Fujiwara. In the back seat, Aomori, now dressed in a sharp suit, rested his chin on one hand, watching the scenery flash by outside the window.

Aomori originally didn't want to go, but alas, the other party offered too much money.

"Speaking of which, Aomori, do you want to move? The suburbs of Z-City are too far and too remote. It's also too unsafe to live there alone; you could easily run into a Monster, you know."

Monsters are non-human creatures born due to various reasons. Most are aggressive and cause numerous disasters to humanity and cities, making them the primary source of chaos in this world.

If it were the Aomori who had just arrived in this world, he might have been afraid of Monsters. However, for the Aomori of today, typical Monsters only serve as Experience for him to level up. He was actually happy to encounter them.

Furthermore, his current residence was a detached two-story house. It was spacious, comfortable to live in, and he wasn't easily disturbed.

Therefore, Aomori rejected Miss Fujiwara's suggestion: "No need. It's quiet there, and I like it."

"Alright then." Miss Fujiwara knew Aomori was a very decisive person and wouldn't easily change his mind once set. She didn't dwell on this "small matter," but she was secretly determined to find an opportunity to convince Aomori to move.

Just as Miss Fujiwara was lost in thought, she suddenly heard Aomori say, "Stop the car!"

"Eh?"

"I said, stop the car!"

"Oh, oh, okay!" Miss Fujiwara was startled by the chill in Aomori's voice and instinctively slammed on the brakes.

When she turned around, Aomori had already vanished, leaving only the opened back car door.

"I didn't expect a Monster to deliver itself right to my doorstep the moment I mention them."

Seeing the thick smoke rising not far away and occasionally hearing screams coming from that direction, Aomori couldn't help but curve his lips into a smile, his eyes alight with excitement. With a flick of his right hand, an ordinary-looking sword appeared in his grip.

[Name: The Best Sword in the Village (White) (Equipped)]

[Description: As the name suggests, it is the best sword in the village.]

[Remark: Beginner's starting gear. The Village Chief wept as he gave it away.]

"Sss... Haa..."

Running, Aomori took rhythmic breaths. Purple electrical sparks surfaced from various parts of his body. His running figure grew faster and faster, finally transforming into a bolt of lightning.

[Name: Thunder Breathing (Blue)]

[Description: Skill Card. Learnable. From Demon Slayer: Kimetsu no Yaiba. After use, enters Thunder Breathing - Total Concentration Mode, significantly boosting physical abilities, reaction speed, and agility, though it imposes a certain burden on the body.]

[Remark: Total Concentration! Thunder Breathing, First Form: Thunderclap and Flash!]

"I'm the Potato Monster that was created from eating too many potatoes! Taste my Potato Bombs!"

In the center of the bustling city, a potato enlarged a hundredfold with hands and feet was laughing wildly. From time to time, it plucked small potato chunks from its head and hurled them into the crowd. These seemingly ordinary small potato chunks caused violent explosions, resulting in heavy casualties among the ordinary citizens passing by.

"Mommy! Waaah..."

"Save me! Can anyone save me?" Many people were crying out.

Just then, blue, dragon-shaped flames carrying an electric current flashed past everyone's eyes. The tyrannical Potato Monster instantly wailed as it was incinerated into charcoal within the blue flames, emitting a strangely appealing aroma.

[Name: One-Sword Style: Flying Dragon Blaze (Blue)]

[Description: Consumable Skill Card (2/3). From One Piece. A One-Sword Style technique of Zoro. The extreme speed of the slash generates friction with the air, causing the enemy's wound to combust after the cut.]

[Remark: Just be cool about it!]

"W-we're saved." The citizens who miraculously escaped looked at the tall, upright figure with gratitude and awe.

"It's a Hero! A Hero came to save us!"

"His name is Aomori! I saw him on TV!"

"He's so handsome..."

Aomori: Transmigrator, Male, 20 years old, 1.8 meters tall, The Ultimate Hottie, possesses the Monster Slaying System, recently debuted, and is now a Hero!