DISCLAIMER: I DO NOT OWN BEYOND THE BOUNDARY.

So for those who know me, welcome my first fic under the Beyond the Boundary category. I noticed that I haven't written much oneshots and mostly focus on multi-chaptered ones. So I decided to spend my day uploading random oneshots from different categories *laughs*. Seriously, I'm taking a break from the multi-chaptered fics, I really need it.

Summary: AU. Hiroomi and Mitsuki have always been curious what Izumi's childhood is like. With Akihito and Mirai's combination to push the two siblings to help them investigate Izumi's past, they give in. What kind of past does Izumi have?

Note: Advanced apologies for OOC's. I haven't watched this anime for a long time (months).

OPERATION INVESTIGATING IZUMI NASE!

Another boring day in school and another day that Akihito and Mirai are doing a co-op mission to try and convince Hiroomi and Mitsuki to help them 'investigate' of Izumi's past. Hiroomi and Mitsuki has been hiding from them for weeks. But for some reason, Akihito and Mirai can find them.

"Ah seriously Aki! Quit it!" Hiroomi said.

"But aren't you curious yourself?" Akihito tempted. "How someone like your sister became so scary?"

Tempting, but Hiroomi shook his head.

"I have no intention of becoming like her one day."

"Why not? Don't you want to use that authority over someone?" Akihito continued his little temptations. "And that someone perhaps would be Mitsuki?"

When Akihito noticed that Hiroomi's attention was caught by his little temptation, Akihito hid his smirk and continued his little enticement. Anytime soon he was sure that Hiroomi will give in. Just a little bit more.

"Mitsuki.."

"Yeah. I mean, with the kind of power and authority Izumi has, and imagine if you have it, you can have Mitsuki for yourself, without her resisting you like she does now." he continued.

"Mitsuki.." Hiroomi muttered.

Akihito can see that Hiroomi was now imagining a lot of things regarding his illusions about Mitsuki.

"So what do you say, Hiroomi?" Akihito asked one last time. An evil grin behind his innocent face.

"You got yourself a deal, man!" Hiroomi said and shook hands with him.

Meanwhile, Mirai and Mitsuki were having the same conversation. Wherein Mirai was telling Mitsuki that if she knew the secret to Izumi's mature and 'scary' attitude, Hiroomi will finally respect her and not bother her anymore. Mitsuki quickly fell for it.

When Akihito and Mirai met up along with the two they tricked into helping them, they high-fived and snickered silently while the two had delusions about how they will be once they find out the secret of their sister, Izumi. That is, if they find out.

"Wait a minute! How are we going to find out about her past?" Hiroomi suddenly wondered.

"Yeah!" Mitsuki agreed.

"We heard about a secret diary!" Akihito informed them. "A secret diary that Izumi once had when she was in her younger years."

"So writing a diary is the secret to her success?" Hiroomi tried to guess.

"No. What's written in the diary is our key to success." Akihito corrected.

"But how do we get it?"

"And where do we find it?" Mitsuki questioned.

"Leave that, to us."

Akihito and Mirai snuck inside the Nase household (which actually Mitsuki and Hiroomi made sure that no one was home so no one will see) without a problem. They wore a uniformed black outfit and wore black bonnets. Hiroomi will definitely shake his head if they'd wear ski masks.

Hiroomi and Mitsuki had their arms crossed as they watched the two pathetic friends of theirs sneak inside the house when no one was home.

"You two done yet?" Hiroomi asked.

"Is the coast clear?" Akihito asked and whispered.

"Yeah, pretty much." Hiroomi used his normal voice, hinting that no one was there to hear them.

"Izumi isn't here either?" Mirai asked, curious where she was. Surely she'd sense their presence. Also whispering.

"No. She's on a mission somewhere out there." Hiroomi shrugged and Mirai was able to breathe with ease.

"Then let's get this over with! Let's go to her room!" Akihito said, no longer whispering.

"Izumi's room is always locked." Mitsuki informed them.

"It won't be so hard to break in."

"Break in? No pick locks in mind or any other plan that will not be too obvious that we've been in her room?" Mitsuki raised a brow on the confident Akihito.

"Breaking and entering. We could just say some thieves passed by."

"Thieves that took her diary." Hiroomi pointed out how ridiculous the cover up was.

"Oh come on, it was the best I've got."

"Or we could pretend the house was attacked by a yomuu!" Mirai suggested.

"A great idea!" Akihito complimented. Everyone else agreed. "Now to destroy the house and pretend that we fought it!"

"It should at least be a really powerful yomuu." Mitsuki notified him.

"Where can we find a really powerful yomuu then?" Hiroomi asked. Surely they can't just hunt a yomuu and ask it to do them a favor. It would be really, really odd and out of their league. But with Akihito on their side, he has a good idea what to do.

They called Ayaka and Ai to do a little destruction of the house, Ai was happily agreeing but Ayaka doesn't agree, knowing that Izumi Nase was going to be involved.

The four plus Ai used their cutest puppy eyes on Ayaka, trying so hard to convince her to agree. They can only enjoy their yomuu selves once and this is the time. They can just imagine Izumi is an enemy and they want revenge while her back was turned.

Ayaka gave in the the give cute people and decided to help them.

They wrecked the house, Ai and Ayaka had their fun, now it's time that Akihito and the others have theirs.

"Where is it?!" Akihito desperately rummaged through Izumi's things.

"For short you guys have no idea where it is." Hiroomi said, crossing his arms at Akihito and Mirai who were looking desperately for the diary.

"What if the diary doesn't exist in the first place?" Mitsuki said.

The sound of deafening silence filled the room.

"Tell me you guys got that information from someone." Mitsuki hoped her thoughts were wrong.

"Well, you see.. we're not sure either." Akihito admitted nervously.

"A-KI-HI-TO!"

"What?!"

"How dare you use me and my sister for your schemes!" Hiroomi cracked his knuckles. "And destroy our house!"

"You agreed to this!"

While Hiroomi and Akihito played chase around the whole room, Mitsuki and Mirai sat together in Izumi's bed. Mitsuki wasn't mad that they were 'used' to get a diary that might have not existed at all, deep inside she was also curious anyways. The two said nothing to each other. Mirai only agreed to help Akihito because he promised to help her hunt down expensive yomuu's.

Until a flash of light caught their attention.

"Mirai, are you seeing what I'm seeing?" Mitsuki asked.

"Yeah."

The two exchanged looks and grinned at each other.

They approached the flash of light appearing from the corner of the room. With excitement, they hit the cracked wall, trying to see what's behind it. It has to be something. The diary perhaps? Why is it glowing? Who knows?

When the wall cracked open, they found a small box that was glowing for some reason. But once they touched the box the glowing had stopped.

"Guys I think we found her diary!" they announced.

Immediately, Akihito and Hiroomi stopped chasing each other and ran towards them to see the box.

"I'm getting really excited!"

"Quick open it!"

They opened the box and saw an old notebook tied by a ribbon. It was to be it! It has to be the one that will tell them everything! Izumi Nase's secrets. Yes, her secrets that they desperately want to know.

Akihito grabbed the notebook and was the first to pull the ribbon away and open the notebook.

The notebook was a blank.

"WHAT?!"

"What's inside?" Mitsuki asked.

"Was her handwriting that bad?" Hiroomi tried to guess.

"It's empty." Akihito showed them the first page then flipped the other page and it was all blanks.

"She hid a diary that has nothing written in it?" Mirai wondered.

"Seems like it, Mirai." Akihito groaned in frustration. "WHY?!"

"Well that's Izumi Nase for you, always ready!" Hiroomi shrugged.

"Ready for what? Does she know we're coming?! Did you tell her?!"

"W- We told no one about this!"

"Then how did she know?!"

Lightning struck, thunders roared, the darkness was too much. But thanks to the moon there was light. Hiroomi, Mrai and Mitsuki's eyes widened as they stared at the shadow that appeared behind Akihito. The shadow of the person they are scared of the most. More scary than a yomuu.

"What's wrong guys?" Akihito asked.

They said nothing when they pointed with shaking fingers at the person behind Akihito.

Akihito turned around slowly, having the feeling that someone was really behind him. He finds Izumi Nase smirking with her arms crossed. Akihito jumped away from her, startled and scared by her sudden presence.

"Find something you like, Kanbara?" she says.

"N- Nothing in particular." he said nervously.

Izumi stepped closer towards them and they took a long step back away from her. When Izumi was away from the shadows, Akihito suddenly blushed.

"Aki, what's wrong?" Hiroomi asked but Akihito said nothing. He looks back at Izumi who was wearing glasses. "EH?!"

"S- Sis, why are you wearing that?" Mitsuki asked in great wonder.

"Just trying it out." Izumi shrugged, her hands crawling up her scalp to fix her hair, showing her face that wore the black glasses with the similar design and style as Mirai's.

"Izumi's- she's-" Akihito couldn't speak.

"So what happened to the house?" she asked, changing the subject. Since obviously the house was torn apart.

"A uhm, a big, powerful yomuu came." Mirai tried to explain. "But don't worry it's gone now!"

"A shame. I actually wanted to beat it."

She takes another step forward and they would take a big step backward.

Izumi reaches for the glasses and takes it off. She threw it behind her and threw her hair backwards, then places both her hands on her hips. Everyone was very cautious about her actions, trying to find the right timing to run.

"So uh, Izumi, since it's late, we'll get going." Hiroomi said nervously.

"Go where?"

"Home?"

"This can't be called home for now." Mitsuki added.

"And where would you sleep?" Izumi inquired.

"With me!" Mirai boldly said.

"Alright. My siblings lives are in your hands, Kuriyama Mirai. See to it that they're alive and well by the time the house is fixed."

Mirai gulped, wishing that she never said that. Everyone else walked away with caution and their hearts racing. When they were far, they ran and didn't look back. None of them looked back- or dared to look back to see Izumi Nase's smirk.

When they got away, they panted and stopped running, catching their breath.

"That was freaking scary!" Hiroomi exclaimed.

"I am never doing this again!" Mitsuki announced as she herself was catching her breath.

"Agreed!" Mirai said.

"But Izumi wearing glasses was priceless!" Akihito exclaimed with great joy. Everyone stared at him, their eyes narrowing as Akihito jumped in joy at the image of Izumi wearing glasses.

"We almost died back there!"

"I'd die taking a picture of Izumi being a bespectacled beauty!"

"How unpleasant."

While the four were arguing about how their lives were almost taken by Izumi, they didn't notice that Izumi was watching them from a distance, holding the notebook filled with blanks. She opens it, flipping the pages revealing that the pages seemed empty but actually have invisible ink.

She closes the notebook and leaves the four alone.

Akihito and the others one lesson in their little investigation. Izumi Nase is good wearing glasses.

The End.