Glass no Hana to Kowasu Sekai

A floating space without gravity where an infinite number of lights shine in different colours: The Box of Wisdom. Inside of this box, there are multiple worlds, multiple timelines, and there used to be many different people. This is where Dual and Dorothy are fighting with enemies called Viruses. Worlds infected by viruses must be erased. That is the duty, the job of these girls. However, one day, Dual and Dorothy feel the presence of a new Virus. Arriving at the scene, they see a girl being attacked by Viruses. After saving the girl, the duo wait for her to awaken so they can ask who she is, where she came from, and where she is going. Finally, when the girl opens her eyes, she says her name is Remo and whispers only one sentence: "I must return to the flower patch."