In Japan, there are many abandoned places. These relics of the recent past are called Haikyos in Japanese. Currently 8 million homes lie empty in the Japanese archipelago due to rural exodus, population aging, transition of life style, the natural disasters... We follow haikyo explorers to an abandoned school in the mountains of Kanto region, meet the owner of an abandoned amusement park in Tohoku region and visit a former coal mining village in Nagasaki which has been gaining an attention as an industrial heritage. We will visit different haikyos to see the evolution of the Japanese society.