With the system now fully upgraded, Ron could once again access his System Inventory.

He reached inside and pulled out a large chunk of sea king meat from the One Piece world, setting it to roast in the small courtyard. As for drinks, he poured himself a cup of effervescent Bubble Wine from the Sabaody Archipelago, replacing the usual contents of his endless wine flask.

Savoring roasted meat from one world and sipping fine liquor from another—

Only now did Ron truly feel like a traveler between worlds.

"System, aside from the addition of these Sign-In Points, what other new functions came with the upgrade?" he asked.

[In response, host: After the system upgrade, a new feature has been added—Map Sign-In, which varies by world. In addition, the chances of receiving substantial rewards from sign-ins have increased.]

"Map Sign-In?" Ron raised a curious brow.

[Allow me to demonstrate.]

As the mechanical voice faded, a luminous display unfolded in front of him—an overhead map of the Demon Slayer world. A blinking red dot marked his current location, while various regions were highlighted with inverted blue triangles, each labeled with their respective names:

[Demon Slayer Corps Headquarters]

[Butterfly Mansion]

[Swordsmith Village]

[Asakusa, Tokyo Prefecture]

[Mount Sagiri]

[Tsuzumi Mansion]

[Yoshiwara Red Light District]

[Mugen Train]

[Fujikasane Mountain]

[Natagumo Mountain]

[Wisteria Crest Family Estate]

[Infinity Castle]

...

[Ding! The red dot marks your current position. The surrounding blue triangles represent available Sign-In points.]

Looking at the holographic screen, Ron nodded slightly. "I see… That is a lot more convenient than before."

With a quick scan, he calculated that if he managed to sign in at all the key locations across Japan, he could probably accumulate around fifteen to sixteen Sign-In Points.

"Time to get to work."

He devoured the rest of the roasted meat, drained the last of the Bubble Wine, then stood up. Fastening the Nichirin Blade to his waist, he left a brief note behind.

A brilliant gleam flashed in his azure eyes—

And in the next instant, Ron vanished from the courtyard.

Ripples stirred in the air above the Butterfly Mansion rooftop.

A heartbeat later—

Dressed in sleek black attire,, and his ancient blade at his side, Ron appeared out of thin air. His tall, lean figure exuded an otherworldly sharpness.

[Ding! Current location—Butterfly Mansion. Eligible for Sign-In. Proceed with Sign-In?]

"Sign in."

[Sign-In complete. You have received: +10 Vitality, +10 Spiritual Power.

Healing Technique leveled up—now advanced to Greater Healing.

Current level: Lv1.

1 Sign-In Point acquired.

Current Points: 2.]

"Hm, the increased reward rate is real… Not bad at all."

Ron gave a small, satisfied nod.

Elsewhere in the courtyard, Kanzaki Aoi was hanging up blankets to dry.

A sudden prickle of awareness made her pause and glance up at the roof.

There was nothing there.

Meanwhile, Ron had already vanished—

Using his Tenseigan Spatial Transfer technique, he instantly left the Butterfly Mansion and reappeared above the Swordsmith Village.

[Ding! Current location—Swordsmith Village. Eligible for Sign-In. Proceed with Sign-In?]

Standing silently atop a treetop, Ron looked down at a focused Kotetsu still fiddling with the Yoriichi Type Zero puppet.

"Sign in," he murmured.

[Ding! Sign-In complete. You have received: +10 Vitality, +10 Spiritual Power.

Acquired Skill: Blacksmithing.

1 Sign-In Point acquired. Current Points: 3.]

…

After completing the sign-in—

Ron vanished from the Swordsmith Village in an instant.

No one even noticed he had ever been there.

Once he left the Demon Slayer Corps headquarters, Ron activated his Float-Float Fruit ability and soared into the sky, zipping toward the next sign-in location with incredible speed.

—Signed in at Asakusa, Tokyo Prefecture. Gained +10 Vitality, +10 Mental Strength.

—Signed in at Fujikasane Mountain. Gained +10 Vitality, +10 Mental Strength. Acquired: Demon Poison Elixir ×1, Antidote ×1.

—Signed in at the Wisteria Crest Family Residence. Gained +10 Vitality, +10 Mental Strength.

—Signed in at the Demon's Dwelling. Gained +10 Vitality, +10 Mental Strength.

...

Sagiri Mountain.

Carrying a bundle of firewood on his back, the masked Sakonji Urokodaki made his way toward home.

He glanced up at the sky, a faint concern crossing his expression.

"Tanjiro… Nezuko… are you both doing alright?"

As he passed the massive boulder that Tanjiro had once cleaved in half—

Sakonji suddenly froze in place. Standing before that very rock was a tall, lean figure.

His nose twitched instinctively.

No scent of a demon. Human, without a doubt…

He relaxed slightly and called out, "You there, who are—?"

The figure turned slightly and cast him a calm glance.

"Tanjiro and Nezuko are doing well. No need to worry."

Sakonji blinked in surprise.

And the next second—

A breeze stirred the leaves.

That young man in black had vanished like a ghost.

Sakonji stood dumbfounded, as if frozen.

"Did I… just imagine that?"

...

Mt. Natagumo — after the great battle.

Ron strolled through the forest, his pace unhurried, as if taking a casual walk despite the webs strewn throughout the trees. Eventually, he stopped at a clearing stained faintly with blood.

"The scent of Tanjiro and Nezuko's blood lingers here. They must've fought the Lower Moon Five at this very spot…"

"There's a trace of Hinokami Kagura too… So Tanjiro ended up using it over here."

Aside from that, he also sensed the auras of Iguro Obanai and another Water Breathing swordsman—a strong one.

"Must be the current Water Hashira, Giyu Tomioka."

[Ding! Sign-in complete. Rewards received: +10 Vitality, +10 Mental Strength.

Additional reward: Flash Step unlocked. Current level: lv1 (max lv10)]

"Flash Step? The one from the Bleach world?"

As the knowledge of Flash Step flooded into Ron's mind, he raised an eyebrow in surprise—and then delight.

Compared to Shave from the One Piece world, Flash Step also allowed rapid movement at speeds imperceptible to the naked eye, but it was even faster. More importantly, it could evolve into high-level techniques like Shunpo Flower and Utsusemi—invaluable assets in combat.

[Ding. Detected that host's 'Shave' skill is already at maximum level (lv10).

It can now be fused with the superior Flash Step skill. Fusion will greatly increase Flash Step's level. Proceed with fusion?]

Ron's brows arched. "Oh? That's an option?"

[Affirmative.]

"Then go ahead. Fuse them."

[Understood. Fusing… Fusion complete! Flash Step skill upgraded to lv7. Special move Shunpo Flower unlocked.]

Ron closed his eyes to feel the change.

In the blink of an eye—

His figure vanished from the clearing and reappeared atop a tree branch on the other side of the forest. A nearby bird, startled by the sudden presence, hadn't even reacted before Ron disappeared again—returning to his original position.

A round trip, completed in less than a tenth of a second.

"This speed… easily over twice as fast as the maxed-out Shave. And there's still room to grow."

Ron nodded in satisfaction.

"System, show me my current attributes."

[Acknowledged.]

[Host: Ron]

Age: 20

Vitality: 5369

Mental Strength: 4320

Transparent World: Level 5

Sun Breathing Technique Mastery: 100%

Swordsmanship: Breath of All Things; Grandmaster of Swordsmanship

Essence of Strength: Level 5

Signature Move: Ultimate Kick — Level 3

Devil Fruit Ability: Enhanced Float-Float Fruit (Second Stage}

Permanent Buff: True Essence of a Thousand Tempers

Lightning Resistance: 50%

Haki Proficiency:

Armament Haki: Level 9 (Third Stage)

Observation Haki: Level 8 (Third Stage)

Conqueror's Haki: Level 8 (Third Stage)

Combat Techniques: Content sourced from MV4LEMPYR – My Virtual Library Empire.

Flash Step: Level 7

Moonwalk: Level 10

Tempest Kick: Level 10

Weapons:

Supreme Grade Blade: Blood Moon

Great Grade Blade: Shusui

Great Grade Blade: Raikiri

Other Great Blades: Oto, Kogarishi

Nichirin Blade

Special Skills:

Mastery in Mechanics, Navigation, and Linguistics

Greater Healing

Purification

Forging

Artifacts:

King's Treasury

Endless Wine Flask

Silver Revolver (Six Bullets per Day)

Unique Items:

Senzu Bean

Special Item:

Distortion Fruit

Special Abilities:

Unsealed Blue Tenseigan— consumes ocular power to activate the following techniques:

Yin-Yang Release: The power to create and shape all things, capable of forging the legendary Truth-Seeking Orbs.

Mastery Over Gravity & Repulsion: The ability to manipulate attraction and repulsion at will.

Dimensional Control: Grants teleportation and influence over space itself.

Vitality Absorption & Mind Control: Can drain the vitality of others and impose absolute will upon others.

Life Bestowal: Infuses energy into constructs, granting them autonomous existence

Ice Imperial Arm: Essence of the Demon — Grants absolute control over ice. Current fusion: 50%

Current Sign-In Points: 9