On an empty bus, the young man Hiroshi (Muxiong Yoshimoto) meets a single mother, Chunxiang Pig (Hiraki Keiko), who is accompanied by a five-year-old boy. Chunxiang, who works in the post office, divorced her husband Fengjian Taro (Matsuura Suke) earlier, living alone with her son in an old apartment, and often dealing with Taro's harassment. Guangzhi and Chunxiang fell in love at first sight, and then they fell into endless love, day and night without tiredness. In the coffee shop on the first floor of Chunxiang apartment, shopkeeper Morita (Meng Ito) and friends Komatsuzaki (Kawayashi Kawayashi) often gather by the river to play sumo games with crickets. Infected by them, Guangzhi also indulged in it. During this period, the relationship between Guangzhi and Chunxiang became delicate, and everything began to develop in an unpredictable direction.
