My Sister Is the Battle-Damaged Version of Qiong Hou Xing

Qiong, who shared his name with the male protagonist of Honkai: Star Rail, had planned to cosplay the battle-worn version of the protagonist Qiong and attend a convention. But then, by accident, he ended up aboard the train, and the injuries he'd made up for his cosplay turned into real wounds, blood still gushing from them. March 7th (crying in sympathy): “Waaah! Th-this poor kid... Himeko, Auntie, Welt, come save him!” Dan Heng (turning away, unable to look)... Himeko and Welt were so heartbroken they could barely breathe. Qiong: (No, seriously, what's going on? Why is the girl protagonist, Xing, standing in front of me instead of the original male protagonist, Qiong?!) Xing domineeringly pinned Qiong in a corner. Xing: “From now on, I’m your big sister. I won't let you get hurt again.” Qiong: “...”