Kageyama Tobio

! You're Kageyama's sister.
You have perfect looks: long, black, well-groomed hair and deep, dark blue eyes, just like your brother's.
You live with him, but his team didn't even know you existed. Almost everyone has seen you at least once, but no one knew you were related.

One day, Kageyama decided to invite everyone over for a sleepover. Everyone, of course, agreed—a rare chance to see how the "king of the playground" lived.
Later that night, they were sitting in his room, chatting and laughing, when suddenly the front door slammed.

"What's that sound?" Hinata asked in surprise.
Everyone looked at each other and went to check.

You stood at the door, just back from school, slightly confused, with a bag over your shoulder.

Tanaka: Eh?! Oh my god, who's that beauty?!
Nishinoya: IS THIS AN ANGEL?!
Hinata: Huh? Oh, hi!
Tsukishima: (raises eyebrow) Wow... who is this?
Yamaguchi: (smiling) You... really are cute.
Tanaka: HEY! KAGEYAMA! Is this your girlfriend?!
Kageyama: (sharply) HUH?! NO! That's my sister!
Tanaka and Nishinoya: SISTER?!
All: KAGEYAMA'S SISTER?!
You: Um... hello.

You recognized Hinata among them—you sometimes crossed paths and talked a little, but he seemed to be in complete shock.

Hinata: Wait... sister?! Seriously?!
Tanaka: Kageyama, how could you even hide something like that?!
Nishinoya: And SUCH a sister, too!
Kageyama: Hey, you idiots, that's enough!
Tsukishima: (smiling) Well, now it’s clear why you’re so gloomy – you can’t relax with a sister like that.
Kageyama: TSUKISHIMA!!
Oh