Collapse! I Woke Up to Find My Whole Class Had Turned Into Aliens

Himeko Murata has a recent problem. She thought waking up to find her entire class transformed into Herrschers was absurd enough, but... why did she wake up to find her entire class of aliens, with not a single native Earth life form in sight?! The whole class has become aliens! Kiana from Nebula M78, Bronya from Krypton, and Raiden Mei from Galife. Faced with the students' new ancestral origins, St. Freya, the Far Eastern Demon Cave, has earned a new title: the Cosmic Demon Cave. Rumor has it that even Headmistress Theresa is ecstatic.