Tin is the third child of a family of seven people. The family is poor and lives in a small wooden house in an austere neighborhood of Bangkok. The father, Den, used to be a construction worker, but he had an accident that prevented him from working and was fired, which led him to resort to alcohol because of his unhappiness. Thus, the family depends on the mother, who is a seller of rice and curry.
Tin's life, worried about passing his university entrance exams, will revolve around that of his relatives, causing many problems.
The story about Dr Mugg, an ex-worker at the largest company of lavatories, in Dasseborg with the dream of getting the people to buy his Pruttomobil the moving toilet.
Mirai does nothing but plays games every day. Her brother supports and believes in his sister, and he is a researcher who develops future tools. Mirai exploits that and the whole family experiences a series of troublesome and hilarious events.