This article studies how environmental sustainability is integrated in a Storyline, which include learning about and through sustainability, conducted in two primary school classes, Grade 2 (children’s age 8- 9) in Sweden. It examines the significant aspects of the Storyline approach in relation to democratic values and young pupils’ sense of agency. In addition, it examines how pupils comprehend the concept of sustainability, and the Storyline approach itself. The empirical material consists of classroom observation and individual semistructured interviews with 20 pupils and 2 teachers. Theories of relational pedagogy are used to analyze the material. The results show that Storyline work depends on a skilled, compassionate and caring teacher, who creates an open climate in the classroom. It is argued that both a pedagogical theoretical foundation, such as relational pedagogy, and a deliberate teaching and learning approach, such as Storyline, are crucial when implementing issues of sustainability in primary school education.