It seems that the Pupa fandom, at least in the fanfiction community, is nearly nonexistent. Because of that, I've decided to take it upon myself to write a story revolving around the series' relationships and plotlines, many of which were very rushed and jumpy in both the manga and the anime.
Because there is next to nothing by way of material for reference, I apologize if my theories and ideas are not as close to canon as they should be. There simply is too little in the series to display EVERYTHING perfectly, and of course I will be adding my own spin on it, since I'm just a fanfiction author and not the producer.
I did not create Pupa. My mind isn't THAT screwed up...yet. All rights go to Mogi Sayaka...though it's not like she would know or care about some guy across the world writing a messed-up fanfiction of an even more messed-up series.
"Onii-chan, wait up!" shouted the high-pitched voice of the young brunette girl, the tail of her new school uniform flapping behind her as she ran to catch up with her brother.
The aforementioned boy stopped walking, turning to face her, the smile playing on his face making him seem several years younger. The brightness of his smile was enough that one could ignore the scars on his body, marks from cigarette butts along his arms and face, burns, cuts, and all manner of scrapes, though no amount of smiling could hide the large red scratch trailing along his left eye.
When the girl had caught up to him, his smile widened, his eyes crinkling closed at the sudden well of happiness that swelled inside him after hearing his sister's voice and seeing her face. Subconsciously, a hand went to her head, and she smiled back at him, her expression as bright and innocent as a child five years younger than she was.
"Don't worry, I would never leave you behind, Yume." the boy said. "I'm here to protect you, I won't let you get lost."
Yume puffed out her cheeks in mock annoyance at his overprotectiveness. It didn't really bother her. She loved him, and she knew that he held his word in high regard. He would not abandon her. "Geez, Onii-chan, you say that like something major happened...You're just walking too fast, and I don't know my way around the school yet!"
Utsutsu laughed, rubbing the top of her head affectionately before removing his hand, receiving mixed emotions from the girl about the now-missing appendage on the top of her head. "It won't be that bad. Aren't your friends coming here too?" He tapped his chin, looking up at the sky. It was cloudy, but there didn't seem to be much chance of rain, at least for now. "Let's see...Kabatsu-san, Obibe-san, and...the quiet one."
Yume giggled. "Kutani-chan. Honestly, it's not that hard to remember!" she said, laughing at the light tinge that appeared in her brother's cheeks
He tapped the ridge under the scarred eye, looking sideways at nothing to show his embarrassment. "Right. And now you've got me on the floor above you!"
It was her first day in middle school now, and in the school they went to, the middle and high school students all went to the same place. Floor 1 was for the middle students, the second was for high schoolers. Nobody knew or care what was on the third floor.
Yume smiled, nodding with a hum of affirmation. "I'll wait for you after class!" she said, knowing that he had probably already memorized her schedule.
The boy's obsession with her didn't faze her in the slightest. Rather, she was happy that her Onii-chan cared so much about her. She wondered if his friends knew about her.
Utsutsu nodded at her statement. "I'll come pick you up around 11, then we can find somewhere to eat." he replied, looking forward at the school, which they had finally gotten to after walking from the house. The town wasn't a major city, there wouldn't be a problem having a car...but Utsutsu was still too young to get one, not that they had the money. He spent every penny he had taking care of the two of them.
It wasn't like their parents would help them. He had long since given up any hope of aid in any form from their mother, and he would rather die than be funded by his father.
His father. Not theirs. He didn't really know the circumstances surrounding Yume's birth, but from the times Shiro vented his frustrations on the boy, he had figured out that Yume had a different father, though who it was he didn't know. Any time he asked Sachiko, their mother, she would always tell them that Yume was a monster.
Utsutsu hated that woman. For reasons she refused to explain clearly, she'd given up on her children, and he knew that it was because he had chosen Yume over her.
He cared more for a sister that was only half-related to him than he did for the woman who birthed them. He was not ashamed to admit it, and when Sachiko started hanging around with other guys and all but vanished from the house, his hatred of the woman had only been solidified.
But all that abusive backstory and such meant nothing right now. It was Yume's first day at this school. He would put up a smile as he always did. He would act like nothing was wrong.
Yume glanced at him as they walked to the entrance of the building. She knew what he was thinking, as clearly as if they were her thoughts as well. She didn't have to see the pain he tried to hide in his eyes or the involuntary clenching of a fist to know that he was thinking about Shiro again.
She knew that his smile, as genuine as it was, was only a mask. She matched the smile with as much intensity as she could muster, to show him without speaking that she was there for him, as he was always there for her.
His smile was just another way for him to protect her. It was to protect her from his hatred, protect her from Shiro, protect her from Sachiko, protect her from the constant whirlpool of emotion that constantly churned within him.
She was not him and didn't know the exact extent of the pain he was always feeling, but she knew him. She knew his mind like her own. They were close, far closer than siblings needed to be.
It wasn't any kind of romantic type of relationship, Yume had no interest in such things and she knew that he didn't either. It was more primal than that. She saw him as her messiah, the person she could tell everything to and expect to be protected by.
He saw her as his crutch, the one thing keeping him sane in a world where everything reminded him of the pain of their past.
She couldn't live without him. It was obvious to her every time she looked at him, every time he defended her.
He couldn't live without her. He was there only to protect her. Without her, his life held no meaning.
He didn't care about the stream of "siscon" and "lolicon" his friends used to pick on him. She was his precious Yume.
She didn't care about Shiro or Sachiko or the scars covering his body. He was her Onii-chan.