In the streets of ultra-modern Shinjuku, Sosuke, a young would-be detective, all of a sudden attacked by a monster robot and falls unconscious. Determined to unravel the mystery, Sosuke joins forces with four members to fight against the robot. Will they be successful?

Tsukiko is in her late 30s and living alone when one night she happens to meet one of her former high school teachers, 'Sensei', in a bar. He is at least thirty years her senior, retired and, she presumes, a widower. After this initial encounter, the pair continue to meet occasionally to share food and drink sake, and as the seasons pass - from spring cherry blossom to autumnal mushrooms - Tsukiko and Sensei come to develop a hesitant intimacy which tilts awkwardly and poignantly into love.