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Inclusion Criteria:

1. Japanese participants (sex not specified)
2. Participants who, in the opinion of the principal (or sub-investigator), are capable of understanding the content of the clinical trial and complying with its requirements
3. Participants diagnosed with social anxiety disorder based on DSM-5-TR (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision) criteria, as determined through an interview using the M.I.N.I. (Mini-international neuropsychiatric interview)
4. Outpatients
5. Participants with a LSAS-J (Liebowitz Social Anxiety Scale Japanese version) total score of 70 or higher and a CGI-S (Clinical global impression-Severity) score of 4 or higher

Exclusion Criteria:

1. Participants with a current or past history of psychiatric or neurological disorders that meet any of the following criteria:

   * Participants with a comorbid psychiatric disorder other than social anxiety disorder as defined by DSM-5-TR (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision) (assessed using the M.I.N.I. (Mini-international neuropsychiatric interview))
   * Participants with a comorbid or past history of schizophrenia or other psychotic disorders as defined by DSM-5-TR (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision)
   * Participants with neurodevelopmental disorders, neurocognitive disorders, or personality disorders (excluding avoidant personality disorder) as defined by DSM-5-TR
2. Participants who have been primarily diagnosed with a disorder other than social anxiety disorder according to DSM-5-TR (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision) criteria within 24 weeks prior to screening
3. Participants with a MADRS (Montgomery Åsberg Depression Rating Scale) total score of 15 or higher
4. Participants who, in the opinion of the principal (or sub-investigator), have not responded to at least two different SSRIs (Selective serotonin reuptake inhibitor), each administered at an adequate dose for at least 10 weeks, in treating social anxiety disorder

• Fukuoka, Japan
• Fukuoka, Japan
• Fukuoka, Japan
• Fukuoka, Japan
• Fukuoka, Japan
• Fukuoka, Japan
• Fukuoka, Japan
• Fukuoka, Japan
• Fukuoka, Japan
• Gunma, Japan
• Hokkaido, Japan
• Hokkaido, Japan
• Hokkaido, Japan
• Hokkaido, Japan
• Hokkaido, Japan
• Hyōgo, Japan
• Kanagawa, Japan
• Miyazaki, Japan
• Osaka, Japan
• Tokushima, Japan
• Tokyo, Japan
• Tokyo, Japan
• Tokyo, Japan
• Tokyo, Japan
• Tokyo, Japan
• Tokyo, Japan
• Tokyo, Japan