The northern hills of Burundi were abandoned by its inhabitants during the years of ethnic conflicts. Today, the people have returned, only to find their land in a very poor state. Tharcice is one of the farmers faced with the difficulties of cultivating crops. Now, thanks his initiative, he is considered as one of the most enterprising farmers in his community: indeed he breeds a cow, which not only provides him with milk, but also produces a very particular energy source...