Single-dose Study to Investigate the Plasma PK of KW-6356 and Its Major Metabolite

Potential subjects will be screened to assess their eligibility to enter the study within 4 weeks prior to dose administration. Eligible subjects will be admitted to the clinical research unit (CRU) before the initiation of investigational medicinal product (IMP) administration (Check-in/Day -1) and administered of KW-6356 orally on Day 1 after an 8-hour fast. Those subjects who complete all the scheduled observations/examinations and are determined to have no clinical abnormalities requiring further hospitalization by the Investigator, will be discharged from the study site on Day 4. Discharged subjects will then visit the CRU on the scheduled visit Days 5, 6, 7, 8 for PK sample collections and safety assessments on Day 12 to complete the End of Study (EOS) visit. The duration of hospitalization will be 5 days: 4 nights from Day -1 to Day 4.