This is a Caelus x Dan Heng Fic - Honkai STAR RAIL. In a celestial realm where stars are the pathways to infinite possibilities, fate intertwines the lives of two extraordinary beings. When their paths intertwine amidst a cosmic upheaval, Caelus and Dan Heng find themselves caught in a situation. Together, they embark on a mission to unite worlds and safeguard the celestial order against the encroaching darkness of Aeons. Meet Caelus, a mysterious and valiant celestial guardian who roams the celestial realms with an ethereal grace and Dan Heng, a Reserved Cold Train Guard, who wields the past that he knows, he will leave behind.