The 1973 novel was written by Kobo Abe and follows a nameless man who gives up his identity to live with a large cardboard box over his head, encountering a range of characters as he wanders the streets of Tokyo。
川口春奈饰演的OL北村志织从房间墙壁听到“一年后的未来在这里的人”的搭话，于是开始跟踪住在隔壁的平野进（高桥一生）。某天神秘声音忽然消失，两人为探究谜底而共同行动，也开始被互相吸引……
