Ushiro

Ushiro is a turn-based RPG which features a young protagonist interacting with ghosts in real-world Japanese locations, such as Tokyo's Shibuya district. Despite receiving write ups, trailers and gameplay footage, the supposed PSP title never saw the light of day.

However, according to Famitsu's interview with Level 5 President Akihiro Hino, Ushiro is back on the books and will be coming to Nintendo Switch instead, although Hino does go on to admit that development is still in its very early stages.