As a promotion for the Kyoukai Senjou no Horizon Portable game for the PSP that release on 25th April, Kadokawa Games will be putting up posters at 8+1 railway stations in Tokyo corresponding to the 8 ships that together make up Musashi, the giant ship where many of the main characters reside. These posters include an AR marker that will show a character suspended in mid-air when viewed with a specific app. The characters shown at each station are different, and different characters will be shown at the same station at random.
Also, at the JR Akihabara station, which is the +1 station, limited amounts of PR cards will be given away. The PR card giveaway and posters at Akihabara will only be from 22nd April to 28th April, while the posters at the other 8 stations (Shinagawa, Fuchuu, Takao, Kokubunji, Okutama, Asakusa, Ogawa and Haijima) will be up from 22nd April to 5th May.
Source: Dengeki Online