Four years later...

A mixture of the sounds of explosions and screaming sounded once again in Musutafu as yet another villain struck. It was a newer villain, one with a mutation quirk that gave him a very sabertoothed cat-like appearance along with the strength and stamina of a big cat. He was on a rampage and had already destroyed two city blocks, seeming to hope that he could impress the villain gangs in the area enough to where they would invite him to join their ranks.

Local heroes rushed in to combat the villain, who was calling himself Seibā, and split off into teams- well, all but one. While the support heroes rushed to get people to safety, the combative heroes tried to wear Seibā down and surround him- hoping that they could capture him before he did more damage.

"Get behind me!" a young heroine called as she leaped in front of a group of children.

"Sirona, watch out!"

The heroine was Sirona, a young woman who had a quirk of water that had been studying with Gunhead for a couple of years, and as one of her comrades called out to her she threw up a barrier of water to protect as many people as she could against the fiery explosion and debris. Once things were cleared, she lowered the barrier and used the water to form a large platform upon which she loaded the children and hurried them to safety.

"Thanks, Miss!"

"Good luck!"

The children waved at Sirona as she gave them a smile and rushed back in to help more people.

Sirona searched every street that she could, rushing in to help wherever she found someone trapped or injured. She'd ferry them out to the evac point where she had dropped the children off or she would summon her water to surround her hands as she healed the wounds as best as she could before getting the people to safety. This continued for nearly an hour and finally, everyone who had been trapped in the vicinity of the battle was at a safe distance away. Sirona made her way to where the combative heroes were and began healing the ones who were hurt the worst.

"Thanks, Sirona. What's the status of the civilians?"

"The civilians in the immediate and surrounding vicinity of the battle have been evacuated. Thirteen and the other support heroes are overseeing their safety and trying to quell the fires."

"Well, it's a good thing you're here; we could use that water of yours right about now."

Another explosion sounded and Sirona threw up a barrier to protect them from the falling debris, but some of the pieces were too strong and she couldn't harden or thicken the barrier quickly enough to stop it or even slow it down. Luckily, though, some of the other heroes were able to either catch the pieces or break them apart into smaller ones.

"Thanks, guys!"

"We need to put an end to this!"

"Get out of my way!"

Sirona looked up as that last voice called out, recognizing it. She watched as someone she wasn't expecting to see blasted his way over them and straight at Seibā as he came rushing towards them.

'Katsuki..?' Sirona watched as Katsuki Bakugo started pounding his fists into the villain, setting off a set of mini-explosions to throw him off balance. 'He's gotten stronger... and more focused..?'

"Sirona, we're good here."

Sirona looked at Death Arms and nodded. "I'll help put out-" She was cut off as Katsuki was sent flying straight towards them. "Watch out!" She summoned her barrier, surrounding Katsuki to provide a cushion.

"What the-" Katsuki looked at the water surrounding him in confusion but before he could find the person making his bubble, he was propelled right back towards Seibā and landed one final punch on the villain- finally knocking him out cold.

While the Police came to collect Seibā, the heroes that were present for the battle- most of them anyway- were able to catch a breather. Katsuki, however, was still steaming from the heat of the battle and he wanted to know who exactly put him in a bubble. He marched his way through the rubble and debris back towards where Death Arms and a few other heroes were.

"Hey, who put me in a bubble?"

"Hmm? Oh, that was Sirona."

"Who the hell is that?"

"She's sort of new to the field. If you're looking for her, I think she went to check on the civilians."

Katsuki made his way over to the evac point, wondering who the hell could have a quirk like that. But as he raked his mind and drew closer to the evac point, he found his answer- one that he was not expecting in the slightest.

Sirona had excused herself from the scene to check in with the civilians and make sure there were no others who needed to be treated. When she had reached the evac point, she was relieved to find Recovery Girl present and looking everyone over.

"Granny!"

Chiyo looked up, smiling when she saw Sirona hurrying over. "Well, look at you! You look wonderful, my dear!"

Sirona hugged the old heroine- her former work-study teacher- and smiled. "It's good to see you."

"It's good to see you, too. I heard that you were finally out in the field, how does it feel?"

"Honestly, nothing like what I was expecting."

"Miss!"

"Miss Sirona!"

Sirona embraced the children as the came over to hug her. "Easy, guys, you'll knock me over."

"Is it over?"

"Is that big mean cat man going to jail?"

"Yes, he's already been taken into custody. It's all over." Sirona replied with a grin.

"Sirona!"

Sirona barely had time to react as someone embraced her with full force. "Uravity?" She beamed at her old friend, Ochaco Uraraka. "Wow, it's been a long time!"

Ochaco hopped up and down with glee at the sight of her old friend. "When I heard you were here today, I could barely believe it! When did you get back in town?"

Sirona made to answer, but before she could the children got her attention and pointed to someone.

"Hey, Miss, who's that? He looks angry."

"Wow, he's scary..!"

Sirona watched as the children hid behind her and she turned to see what was the matter- her eyes widening when she saw who was standing there. "Katsuki..."

Surrounded by a group of small children was this Sirona chick. But as Katsuki drew closer, he noticed some very familiar things about her and stopped in his tracks when Sirona stood straight and looked at him.

"You...?"

Before him stood Rui Imari, aka Sirona. Her hair was much shorter, resting just above her shoulders, but just as blue. She was dressed in a costume consisting of a rouge pink dress with a single strap that sported a brooch, a bracelet at each wrist, rouge pink to melon orange-colored ombre boots that each sported three nodes, and a water flash dangling at her hip from a melon orange belt. She was a bit taller than the last time he had seen her and had filled out a bit more as well.

"Katsuki..."

Katsuki's eyes narrowed and he turned and stormed off, needing to sort through some things.

"Miss Sirona, is he a friend of yours?"

"He was once, yes..." Rui watched as his shoulders sank a bit and she sighed. 'Katsuki...'