The Blue-Eyed Material
Alternative title: Seiten no Hekigan
Story Overview
From MangaHelpers: Even after one month of transferring to a new school, Aoi keeps her distance from her classmates. Her childhood friend Haruka always tries to push her to be more sociable, but Aoi just pushes her away. One day, while Aoi was skipping class and eating lunch on the school balcony, a slime-like substance drops right on top of her. The slime slowly forms itself into... a human girl? An odd relationship between Aoi and her new alien(?) sister begins. [DrCoke]