"Whoa—"
Tiona's eyes went wide as the ring on her hand suddenly flared to life, two flames of completely different colors dancing above it.
"Tione, look! It's really burning!"
Tione sighed and raised her own hand, where two rings gleamed with the same crimson and golden flames.
"I actually lit mine first," she said. "And it looks like ours burn with the exact same colors."
"Huh?"
Tiona leaned closer, her sharp eyes quickly spotting the truth—Tione's rings were identical to hers, down to the smallest detail.
Tsuna smiled faintly. "Guess it really proves you two are sisters. Even the type of flames you produce are identical."
He honestly hadn't expected Tiona to ignite the Dying Will Flame of the Storm too. He'd assumed her aptitude would align with the Sun Flame alone—but apparently, both sisters were exceptions.
The Amazon twins shared far more than appearances; their hidden potential ran deep in the same direction.
"The red flame is called the Storm," Tsuna explained, "and the gold one is the Sun."
"The Storm's characteristic is Disintegration. The Sun's is Activation."
Halfway through his explanation, he noticed Tiona's expression had gone oddly blank—like a college student zoning out in a lecture. He sighed, reached out, and gave her cheek a playful pinch.
"Focus, Tiona."
"Alright, let me put it in simpler words so you can keep up."
"The Storm Flame boosts your offensive power. It makes your attacks sharper—strong enough to tear through an enemy's defense or body with ease."
"The Sun Flame enhances your physical ability—your reflexes, strength, stamina. It can even accelerate healing during battle, letting you fight longer without collapsing."
Tiona's eyes cleared as understanding dawned.
"Oh, I think I get it now," she said. "Storm's for offense, Sun's for boosting myself."
"In other words, both are for fighting. Makes sense, right?"
Tsuna chuckled. Her logic wasn't wrong, and for her, that level of understanding was already impressive. She reminded him of a college classmate he once had—someone whose eyes were always a little too clear for their own good.
He patted her on the head.
"Yeah, that's about right. Just remember—the Storm Flame's extremely destructive. Don't ever use it on anyone from your Familia. It's dangerous."
"Who'd even attack their own allies?" Tiona grumbled, but she didn't move away from his hand.
Watching them, Tione cleared her throat pointedly.
"Tsuna," she cut in, "you mentioned you'd be training us this week. How exactly are we doing that?"
Tsuna withdrew his hand and nodded. "Technically, igniting the Dying Will Flame was the first stage of training. Most people struggle just to trigger it through the ring. But since both of you managed it so easily, we can skip ahead to application practice."
"Once you've learned to control and use your Flames properly, you'll go see Miss Loki for an update to your Falna data. If we're lucky, your Flames might even register as your own unique magic."
If that happened, it'd be a huge deal.
That would mean a third-party power could be converted into a recognized ability within the Falna system—an enormous loophole.
If that's possible, then the implications are insane…
He shook his head, pushing the thought aside for now. "Let's first see if your Flames can actually be recognized by the Falna. One step at a time."
A door materialized in the middle of the sisters' room.
Tsuna opened it and stepped through first.
Tiona and Tione exchanged a glance, then followed him in.
The door vanished behind them, and the view before their eyes changed completely.
"This is… Orario," Tiona breathed, pressing her palms against the floor-to-ceiling window. From this height, she could see the entire Labyrinth City sprawling below.
"It really is Orario!" Tione hurried to her side, eyes wide. From this vantage point, the city looked almost like a living map.
"Then… are we in the Babel Tower?" she asked.
Judging from the view, it had to be—the towering structure at the very center of the city.
"Exactly," Tsuna confirmed. "This space was modeled after the old punishment chamber beneath the Tower."
"It's a kind of simulation—a sandbox of Orario, where I can recreate or modify events for training or strategy planning. Basically, it's another kind of Challenge Space. Since I built these doors myself, everything inside is under my control."
He smiled faintly. "So using it for your training is no problem."
Tiona and Tione exchanged a look. They both understood instantly—
Unlike the public Challenge Space, this one was personal, made just for them. A private battlefield.
"I doubt words alone will help you grasp it," Tsuna continued. "You'll learn faster through experience."
He turned toward the window. "For your first session, let's start with a group of Minotaurs."
Suddenly, the ground rumbled.
The twins looked down and saw them—an entire horde of Minotaurs rampaging through the streets of the city replica.
They blinked once in surprise, then identical grins spread across their faces.
"Well," Tione said, eyes glinting, "what's the plan?"
Tsuna stepped up to the window, waved his hand—and the glass shattered outward. He stood at the edge, the wind whipping through his hair.
"Come with me," he said simply.
Then he jumped.
Without a second of hesitation, Tiona and Tione followed, leaping straight out after him through the broken glass.
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You can read up to chapter 165 on patreon.com/NiaXD.