Sebastian's (16) sheltered small-town life changes suddenly when his family takes in 15-year-old Kolja, supposedly the son of his father's recently deceased girlfriend. In addition to his little sister, another teenager now lives with them. Although the two boys are strangers to each other at first, they begin to open up to each other more and more and discover that they are biological brothers. The relationship of trust with his parents breaks down and when Sebastian and Kolja become closer than they expected, Sebastian's life is suddenly turned upside down, as he has found not only a soul mate in his new brother, but also a real, first love. Overwhelmed by their feelings, the two hide their relationship, but when the secret, incestuous relationship is discovered, the family breaks out of the social structure of the small town and comes into conflict with societal norms. Everything that follows is a rollercoaster of emotions.