Shadow Twin

She's back!?

It was just a normal day at Shiratorizawa.
The team was on a 10 minute break.
Tsutomu was happily talking to his two boyfriends
Semi and Shirabu. "Hey! Attention! We have a visitor coming at Shiratorizawa, she will stay for a while due to a incident in her school." Said the Coach "she's coming in 5 minutes so finish up what you're doing" "Yes sir!" Everyone said

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5 minutes later
"I wonder who it is?" Said Tsutomu
"Guess we're gonna find out" said Shirabu
"Everyone meet Tsutomi Goshiki!"

Goshiki's eyes was in terror.
His sister, who made his life miserable every since they came out the womb.

"Hi Tsutomu~. How's mom and dad doin~"
"They're fine, they really miss you" said Goshiki in a rude tone. "Aw that nice that Dad and Mom misses me" "That your sister?!" Said Tendo. "Yup, specifically my twin sister" "You have a twin?!" Said
Both Semi and Shirabu. "Yeah, I just don't talk about her." "Aww, Tsu why not?" "I dunno, I really don't have anything to say about you" "Why is that?"Tsutomi replied. "I don't know"

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After they introduced themselves to Tsutomi. Everyone continues to practice. Tsutomi asked to play too. While they were playing, Tsutomi made a really good spike. "Woah, that was a hella good spike" said Tendo. "Yeah, probably better than Ushijima and Tsutomu" Taichi said. That made Tsutomu blood boil. He was already tired to hear his sister was better than him, he didn't want to hear it again. "Yeah I mean, I been ace many times before."
'Don't remind me' said Tsutomu in his head. "Hey Tsu did you see that spike! It was amazing!" Semi asked. "Yeah, amazing" Tsutomu said in a fake happy tone. "Thanks" Said Tsutomi.

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Practice was over. Everyone decided to hangout. But Tsutomu denied the offer as his excuse was he was tired and wanted to relax.
While was was walking back to his dorm. He had a question in mind. What did his sister want with him?