Pseudo-sibling literature.
Sister Liang fell from the sky.
Liang Sukai never thought that a girl would fall from the sky when he was soaking in hot springs. At that moment, he just wanted to call the police.
Liang Jianqing: Who knows, my family. I was sleeping soundly in the hot spring pool and was suddenly thrown away.
Shirokiri Kuro's Paranoid Sister's Handsome Brother Who Takes the Hook of a Desire