Diamond is Unbreakable - Chapter 114 
Josuke and Okuyasu become highly suspicious of the man pretending to be an alien after he mysteriously took out two fresh ice cream cones from his bag. Asking what he wants from them, the man presents himself as Nu Mikitakazo Nshi, a 216 years old alien inspecting Earth.
Thinking that he is a Stand user instead, Josuke and Okuyasu pry further into his apparent act, being highly skeptical, but the "alien" continues to claim not to be from earth. They decide to play along with him and ask to see any alien technology he may be keeping in his bag. Suddenly, a siren is heard from a nearby firetruck, causing Nu to freak out and develop blisters all over his body.
Unable to bear the noise, he reveals that he has the ability to shapeshift. After transforming into a pair of shoes, he begs Josuke to wear him and take him away from the sound. The alien's power allowed Josuke's running speed to double, causing Josuke to leap across the street. Okuyasu is left alone and wonders where Josuke went.