Loosely based on the light novels and canon.

Just an excuse to make a story in which all Hiragi siblings want Guren except for Shinoa.

Notes

Whoops, this story is hard to write. Quite fun to write, though.

There are three parts of this story.

MAHIRU

"As a person that the esteemed Hiragi Mahiru betrayed her family for, you are disappointing." Leaning on the wall was a white-haired alpha, condescending smirk curled on his lips.

"Don't talk to Guren-sama like that!" Dark blue eyes narrowed, even as Sayuri fretted about Shigure's bruised wrist.

Shinya shrugged. "I'm saying the truth." He glanced at the dark-haired boy sitting on the chair. "I thought that you would stand Seishiro for your aides, but you didn't. It doesn't matter how much physical prowess you have, your mental is weak."

Guren gritted his teeth, knuckles white from holding onto the armrest. Mind, kept replaying what happened minutes ago. How close was he to lose Shigure. That he couldn't even stand up to protect her from Seishiro's hands. And the only reason she was saved, because Shinya protected her.

Not him.

"I wonder..." Shinya muttered, "If you're worth for Mahiru to lose her life for." The boy walked to the infirmary door. "Because for now, I think you're not worth for Shinoa-chan to lose her sister for."

Silence reigned the infirmary after Shinya left. Both Sayuri and Shigure stared at their master nervously.

Because those words of Shinya's parting shot? Hit the nails deeply.

He'd been followed.

Of course, as Ichinose, it was expected for him to be a target of assassination. This person, however, was quite unusual.

"Shigure, Sayuri, I have errands for you to do."

Both perked up, listening attentively for what he said. He knew how much they didn't want to leave him alone, but some matters were more important than even his life.

He waited until his troublesome bodyguards not on sight. "Saitou," Guren called.

In front of him was a young man in suit, with dull eyes and benign smile. How deceptive that look, since Saito was inhuman. "Greetings."

"Cut the crap," Guren said. "Why are you here for?"

"How rude," He chuckled. "I came to ask your cooperation, of course," Saitou said. "The war between the Hyakuya Sect and Hiragi will escalate further. You, as the heir of Ichinose, I wonder which side will you take?"

"My father is the head of Ichinose, not me."

"Of course," He agreed. "But you have to admit your father is weak, Guren-sama."

Purple eyes narrowed. Saitou had the gall to say that to his face. For Guren, his father wasn't weak. He simply had to do what he could for the survival of Moon Demon Company. "Mahiru had finished the cursed gears. There's no need for me to be involved."

"She did." Saitou tilted his head. "But there's also another experiment she did. The Seraph of the End with the Hyakuya Sect."

Guren froze. He remembered once when he was tangled on her bed, Mahiru talked about Seraphs. Of their wings and immense power.

"It's only a matter of time until the vampires get into the fray." Saitou offered his hand. "Will you take my side in this war?"

"Fuck off," He said instead.

Saitou laughed. "Until next time, Guren-sama."

Guren stood on the street, wondering of what Mahiru had done.

For Guren, Mahiru was his sun. Bright and full of ambition. Her graceful stance compelling people to follow her lead.

And she, the alpha daughter and the main heir of Hiragi chose him, a lowly born omega from Ichinose.

Days they spent together were sparse, in silence. The only people who knew were his aides, and both of her siblings, Shinya and Shinoa.

In those times, she expressed how much she wanted to be with him. How much hatred she had with the Hiragi family. How much she wanted to bring them down.

The hatred that matched his.

But in the end the choice she made to betray her family was also the choice she made to leave him forever.

Shinya stood across of him. "Do you know what Mahiru is doing?"

"What are you talking about?"

"She'd been discreet. She wouldn't even tell Shinoa-chan. I wonder what is it about."

Guren agreed. These past few months, little by little there was something changed. Mahiru had always been secretive, but she'd been more elusive than usual.

Purple eyes glanced at the white haired boy. Mahiru and Shinya's relationship was strange. They weren't close in a sense, but they told each other everything and had some kind of trust between them that stemmed from the same hatred for the Hiragi family. While he knew Shinya didn't approve of the relationship between Guren and Mahiru, but he still kept silent about it. As to why, Guren didn't know.

"I don't know," Guren said.

The blue eyes pierced his. "I guess so," The boy said. He turned his eyes toward the ashen haired girl standing on the examination ground. "We'll know in time."

The war started at his supposed fight with Seishiro.

Blood seeped the examination ground, and there she stood. With her long ashen hair and the sword on her hand.

"Mahiru." Guren called. "What are you doing?"

The girl turned her head. Her expression turned soft at his sight. "Something I have to." Mahiru touched his cheek. "Humanity is in peril, Guren."

"... And killing?"

"Sacrifices have to be made." She caressed the blade on her hand. "Guren, this is a cursed gear that I've completed. For our survival."

The sword was dark, immense waves of power agitated him. He saw what she could do with that sword, the fallen students dead on the ground.

"But I haven't finished, there's another thing I have to do," She said. "I'm sorry."

He choked. "You'll leave, just like that?"

"You know I'll do anything for you. To protect you, to ensure your survival." The brown eyes stared his in regret. "Even if it means we have to part."

She kissed him, deeply. As if her heart was breaking, just like his.

"I love you." She smiled. Then she was gone with Saitou in tow.

The next time he met her was the week after Hiragi declared her betrayal.

She was just as beautiful. Tired, but still as strong as she always was. That evening, they reacquainted with each other bodies. Him, holding onto her and smelling her scent. The alpha caressed his hair, as she told him the things happened in their separation.

Her tongue twisted with his, saying 'I love you' over and over. Her tears mingled with his, even as they tried to imprint each other's face in their memories forever.

She gave him the sword, Asuramaru. Smiling softly, then Mahiru was gone.

The next day Shinya called him telling Mahiru was found dead.

Guren missed her.

He remembered her soft voice, the warmth as she held him in her arms, the brown eyes he loved so much.

He always admired her strength. Her drive to get what she wanted, even if it brought her to her demise. Even if in the end she left him forever.

And he didn't need Shinya to tell him how coward Guren actually was.