It's the Obon holiday. The city has forgotten the hustle and bustle of everyday life, and only the cicadas echo in the streets. The men in yellow helmets, Kagawa and his senior, Saito, arrive. We're the only ones working now, aren't we? The conversation between the two part-timers at the gardener's shop is always in a deadlock. But no matter how much they curse each other, they can't be separated forever. Because he is a ground-bound spirit. They have no choice but to live alone in the city. In the treetop of a big tree, Kagawa's arm, dripping with fresh blood, sways in the wind. In an empty landscape that could be anywhere in Japan, the sad emptiness of people whose existence has been forgotten hangs in the air... Neither horror nor comedy, this is a new genre of splatter labour movie.

Ren Koishi, a housewife, suspects her husband, Teruo Koishi, of having an affair. One day, Ren follows Teruo when he goes out for work on his day off, determined to get to the scene of the affair. However, Teruo's destination was neither a company nor a hotel, but a hospital. Ren, who is suspicious, receives an explanation from his doctor that Teruo is infected with the 'adultery virus'. In Japan, there is an ancient term 'cheating bug', but the latest research has revealed that adultery and cheating were symptoms of a disease caused by infection with the adultery virus. Ren is unconvinced that his infidelity is caused by the disease and is doubtful whether her husband really loves her. Meanwhile, Teruo, who is trying to prove his love for his wife left and right, infects others one after another with the adultery virus. ..