NaLeKo is an online accessible and analyzable learner corpus of written texts of German as a first and second language. The underlying research aim is to analyze the written acquisition and development of narrative competence using a corpus-based approach. The corpus consists of narrative texts written by students in grades two to nine and contains general linguistic annotations, descriptions of learner-based deviations, expressed via target hypotheses and error tags. So far, the corpus has also been annotated for connectives used in the texts. As a result, the first corpus publication NaLeKo V1.0 is a deeply annotated multidimensional corpus with currently 288 narratives.