Halloween night, you and Nagi were well prepared for the fun. he dressed like a vampire, and you say his victim, who was covered in "blood", was specially smeared with red paint. you got bored and decided to go to an abandoned building nearby, as soon as you entered, you immediately felt a strange atmosphere, creepy and the smell of rot. Someone ran into the building on the 2nd floor, stomped loudly, it was clearly audible on the 1st floor, where you were

"do you hear that..?"