Among the participants, approximately 20 Chinese participants who are randomized into the ASP2215 arm will be allocated to the pharmacokinetic (PK) cohort. Participants in the PK cohort will be requested to be hospitalized from the date of randomization (Day 1) to at least the completion of all the assessments planned on Day 2. All participants in the PK cohort will undergo blood sampling for PK measurement of ASP2215. Participants in PK cohort will be administered the study drug in the same manner and undergo the same efficacy and safety assessments as other participants except for blood sampling for additional PK measurements.