Participants will be in the study for up to 61 weeks including 52 weeks of study treatment. During the study, participants will visit their study clinic for multiple times. conditions: Generalized Pustular Psoriasis conditions: Erythrodermic Psoriasis studyType: INTERVENTIONAL phases: PHASE3 allocation: NON_RANDOMIZED interventionModel: PARALLEL primaryPurpose: TREATMENT masking: NONE count: 20 type: ESTIMATED name: TAK-279 measure: Percentage of Participants Achieving a Static Physician's Global Assessment (sPGA) of Clear (0) or Almost Clear (1) With a ≥2-Point Decrease from Baseline at Week 16 measure: Percentage of Participants Achieving ≥75% Improvement from Baseline in Psoriasis Area and Severity Index (PASI) Score at Week 16 measure: Percentage of Participants Achieving an sPGA of Clear (0) or Almost Clear (1) With a ≥2-Point Decrease from Baseline at Week 52 measure: Percentage of Participants Achieving an sPGA of Clear (0) or Almost Clear (1) With a ≥2-Point Decrease from Baseline at Both Week 16 and Week 52 Visits measure: Percentage of Participants Achieving an sPGA of Clear (0) at Week 16 and Week 52 measure: Percentage of Participants Achieving an sPGA of Clear (0) or Almost Clear (1) at Week 16 and Week 52 measure: Percentage of Participants Achieving an sPGA of Clear (0) or Almost Clear (1) at Week 16 and Week 52 Visits measure: Percentage of Participants Achieving PASI-75 at Week 52 measure: Percentage of Participants Achieving PASI-90 at Week 16 and Week 52 measure: Percentage of Participants Achieving PASI-100 at Week 16 and Week 52 measure: Percentage of Participants Achieving PASI-75 at Both the Week 16 and Week 52 Visits measure: Percentage of Participants Achieving PASI-90 at Both the Week 16 and Week 52 Visits measure: Percentage of Participants Achieving a Scalp-specific Physician's Global Assessment (ssPGA) of Clear (0) or Almost Clear (1) With a ≥2-Point Decrease from Baseline at Week 16 and Week 52 measure: Change from baseline in ssPGA at Weeks 16 and 52 measure: Percentage of Participants Achieving a PGA of the Hands and/or Feet of Clear (0) or Almost Clear (1) With a ≥2-Point Decrease from Baseline at Weeks 16 and Week 52 measure: Percentage of Participants with a Baseline Dermatology Life Quality Index (DLQI) Score ≥2 who Achieve DLQI Score of 0 or 1 at Week 16 and Week 52 measure: Change from Baseline in DLQI at Week 16 and Week 52 measure: Change from Baseline in Nail Psoriasis Severity Index (NAPSI) at Week 16 and Week 52 Among Participants with Nail Involvement at Baseline measure: Change from Baseline in Body Surface Area (BSA) Affected by Psoriasis at Week 16 and Week 52 measure: Percentage of Participants with Generalized Pustular Psoriasis Who Achieve a Generalized Pustular Psoriasis Global Assessment (GPPGA) Pustulation Subscore of No Visible Pustules (0) at Week 16 and Week 52 measure: Percentage of Participants with Generalized Pustular Psoriasis Who Achieve a GPPGA of Clear (0) or Almost Clear (1) at Weeks 16 and Week 52 measure: Percentage of Participants with Generalized Pustular Psoriasis Who Achieve a GPPGA of Clear (0) at Week 16 and Week 52 measure: Percentage of Participants with Generalized Pustular Psoriasis Who Achieve ≥75% Improvement from Baseline in Generalized Pustular Psoriasis Area and Severity Index (GPPASI) Score at Week 16 and Week 52 measure: Change from Baseline in Japanese Dermatological Association Severity Index (JDASI) Score at Week 16 and Week 52 for Participants with Generalized Pustular Psoriasis sex: ALL minimumAge: 18 Years stdAges: ADULT stdAges: OLDER_ADULT facility: Nagoya City University Hospital status: NOT_YET_RECRUITING city: Nagoya state: Aichi country: Japan lat: 35.18147 lon: 136.90641 facility: Fujita Health University Hospital status: NOT_YET_RECRUITING city: Toyoake state: Aichi country: Japan lat: 35.038 lon: 136.99931 facility: Kimitsu Chuo Hospital status: RECRUITING city: Kisarazu state: Chiba country: Japan lat: 35.38329 lon: 139.93254 facility: Juntendo University Urayasu Hospital status: NOT_YET_RECRUITING city: Urayasu state: Chiba country: Japan lat: 35.67054 lon: 139.88862 facility: Hospital of the University of Occupational and Environmental Health, Japan status: RECRUITING city: Kitakyushu state: Fukuoka country: Japan lat: 33.85181 lon: 130.85034 facility: Isesaki Municipal Hospital status: NOT_YET_RECRUITING city: Isesaki state: Gunma country: Japan lat: 36.31667 lon: 139.2 facility: Kobe University Hospital status: NOT_YET_RECRUITING city: Kobe state: Hyogo country: Japan lat: 34.6913 lon: 135.183 facility: Tokai University Hospital status: NOT_YET_RECRUITING city: Isehara state: Kanagawa country: Japan lat: 35.39932 lon: 139.31019 facility: Mie University Hospital status: NOT_YET_RECRUITING city: Tsu state: Mie country: Japan lat: 34.73333 lon: 136.51667 facility: Kansai Medical University Hospital status: NOT_YET_RECRUITING city: Hirakata state: Osaka country: Japan lat: 34.81352 lon: 135.64914 facility: Saitama Medical University Hospital status: NOT_YET_RECRUITING city: Iruma state: Saitama country: Japan facility: St.Luke's International Hospital status: NOT_YET_RECRUITING city: Chuo City state: Tokyo country: Japan lat: 35.57779 lon: 139.71685 facility: Teikyo University Hospital status: NOT_YET_RECRUITING city: Itabashi-ku state: Tokyo country: Japan lat: 35.74893 lon: 139.71497 facility: The Jikei University Hospital status: NOT_YET_RECRUITING city: Minato-ku state: Tokyo country: Japan lat: 34.2152 lon: 135.1501 facility: Tokyo Medical University Hospital status: NOT_YET_RECRUITING city: Shinjuku-ku state: Tokyo country: Japan lat: 35.2946 lon: 139.57059 facility: Fukuoka University Hospital status: NOT_YET_RECRUITING city: Fukuoka country: Japan lat: 33.6 lon: 130.41667 facility: University Hospital, Kyoto Prefectural University of Medicine status: NOT_YET_RECRUITING city: Kyoto country: Japan lat: 35.02107 lon: 135.75385 facility: Okayama University Hospital status: NOT_YET_RECRUITING city: Okayama country: Japan lat: 34.65 lon: 133.93333 facility: Nippon Life Hospital status: NOT_YET_RECRUITING city: Osaka country: Japan lat: 34.69374 lon: 135.50218 facility: Osaka Metropolitan University Hospital status: NOT_YET_RECRUITING city: Osaka country: Japan lat: 34.69374 lon: 135.50218 hasResults: False