The study is Post-Marketing Surveillance on the Long-Term Use of Prazaxa® Capsules in Japanese patients with nonvalvular atrial fibrillation after the availability of idarucizumab. Even after the availability of idarucizumab in real clinical practice, appropriate use of Prazaxa® Capsules will continue. The patient population who receive Prazaxa® Capsules and the safety profile of Prazaxa® Capsules is not expected to change. This study can confirm appropriate use with prospective investigation in the routine medical practice