Glacier sister, don't want to be a sandwich

As the youngest sister of the Bingchuan family, Bingchuan Yuege faces two older sisters, one hardworking and the other talented.
The care given to her by her two sisters made her choose the lying down faction.
She originally thought that she could just lie down and get by, but she met many girls who changed her life.
The little animal that liked to give her stones when she was in kindergarten, the eldest daughter of Bai Yueguang who she met in junior high school, and the daughter of the big star who smelled like cucumber
The elegant bass violinist like a mother and the vain pink-haired guitarist
And... that guy who looks tough but is actually super soft, the black drummer with long straight hair and the wildcat-like white guitarist
But... could you explain it?
Why put her in the middle?
When Bingchuan Yuege woke up in the morning, she looked at Lenai and Lixi sleeping on either side of her, and a question mark popped up in her head.
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I will start writing from the old group, and then switch to mygo after mujica starts playing.