The purpose of the investigation is to confirm the followings under the post-marketing actual use of Fasenra® Subcutaneous Injection 30 mg / 10mg Syringe (hereinafter referred to as Fasenra). 1. Development of unexpected related AEs\* 2. To grasp development of related AEs\* in the real-world post-marketing setting. 3. Effectiveness (pulmonary function and asthma control) \* AEs investigator or MAH considers that there is a reasonable possibility that the experience may have been caused by the drug