Hologram is the first Japanese mini album by Key. It was released digitally on December 21, 2018 through EMI Records, with its physical release following on December 26, 2018.
On December 5, 2018, it was revealed that he was planning to release his first Japanese extended play, including four original Japanese songs and the Japanese version of his Korean single "One of Those Nights". The cover artwork was designed by the illustrator Chocomoo in collaboration with Key. The songs "Hologram" and "Why Are You Here" were broadcast on J-Wave on December 12 and 13. To promote the EP, Key held a live event titled Key Land at World Memorial Hall in Kobe on December 22 and Yokohama Arena on December 25.
I. Album Details
| Type | Studio (Mini Album) |
| Artist | Key |
| Released | December 21, 2018 (digital) December 26, 2018 (physical) |
| Recorded | 2018 |
| Length | 17:30 |
| Label(s) | EMI Records Japan SM Entertainment |
| Distributor(s) | Universal Music Japan |
II. Tracklist
| Title | Lyrics | Producer | Arrangement | Duration |
| Hologram | Meg.Me | Sean Alexander, Drew Ryan Scott, Gabriel Steve Lopez | Lopez, Avenue 52 | 3:11 |
| Why Are You Here (feat. CoCo) | Junji Ishiwatari | Andreas Oberg, Fredrik, Thomander, Maria Marcus | Thomander | 3:18 |
| Power | Tetsuya | Tetsuya, Obi Mhondera, Kyler, Niko, Kevin Charge | Charge | 3:57 |
| City Girl | Meg.Me | Alexander, ScottToyo | Toyo | 3:53 |
| One of Those Nights (Japanese version) | Kenzie | Noah Conrad, Jake Torrey, Riley Thomas Donnell, Daniel Doran Henig, Adrian McKinnon |
Conrad, Torrey | 3:11 |
III. Spotify
IV. Performance Video
