I Am an Alien (ぼくは宇宙人 Boku wa Uchūjin) is the twentieth story arc in Diamond Is Unbreakable.
It narrates Josuke and Okuyasu encounter with the self-styled alien Nu Mikitakaze Nshi, and Josuke's subsequent attempt at cheating at a game of cee-lo against Rohan with the help of his new alien friend.
Josuke and Okuyasu encounter Mikitaka Hazekura, who proclaims to be a bicentenarian extraterrestrial while displaying a Stand-like shapeshifting ability titled Earth Wind and Fire. Josuke befriends Mikitaka and exploits him by cheating money from Rohan in a game of dice by having Mikitaka become a die. Rohan discovers that Josuke is cheating but cannot deduce how while Mikataka has difficulties maintaining the masquerade.
Josuke and Mikitaka finally get away scot-free while Rohan's house begins to burn down because of a magnifying glass' refraction.
- 113 (378). I Am an Alien, Part 1
- 114 (379). I Am an Alien, Part 2
- 115 (380). I Am an Alien, Part 3
- 116 (381). I Am an Alien, Part 4
- 117 (382). I Am an Alien, Part 5
- 118 (383). I Am an Alien, Part 6