Houkago no Invader

One day, an “alien portal” suddenly appeared. Known simply as “The Space,” the area now occupied by the aliens is said to contain a “wish machine,” an alien relic that can make any wish come true. In m-city of Tokyo metro, Ao Akashiro, a girl wearing a sailor-suit school uniform, often sneaks into “The Space” in search of the wish machine. There, she meets a “black cat” who can speak telepathically....... (Source: Magcomi, translated)