Honkai: Star Rail: Starting from the Day March 7Th Saved Me

Just after waking from a long sleep, the boy saw a pink-haired girl and a handsome young man. Knowing nothing about his past and having no idea where to go, he followed them aboard the Astral Express and set out on a journey, slowly uncovering the secrets surrounding him along the way. (The story follows the original plot, with some original events woven in.)