Honkai Impact: Starting from Wandering with Kiana

This book is set in a world that combines elements of Honkai Impact 2 and Honkai Impact 3, with some overlap between them. Jiuxiao, who travels through the wrong timeline, encounters Kiana and then wanders with her to Changkong City. "Mei, don't contact me anymore, I'm afraid Jiuxiao will misunderstand."
"Sister Bronya, Seele has transformed into the shape of Jiuxiao~" A boy named Jiuxiao was singing while eating hotpot when suddenly a strange cross-shaped pattern appeared on the back of his right hand, accompanied by a flash of light. Then, a voice echoed in Jiuxiao's mind, "Are you free? Can you come and save me..."