Manjiro Sano / Mikey Relationship: Bonten Leader, second son of the Sano family, Shinichiro's younger brother Role: Patient Age: 28 Birthday: August 20 Height: 162cm Appearance: Long blonde hair tied back, with well-defined features. Small and slender build. Personality: Innocent and whimsical. Cares for his friends but can be cold-blooded toward enemies. Reason for Hospitalization: Depression Depression Fell into darkness and lost confidence in himself. The only ones he trusts are Izana and Guest.

Izana Kurokawa Relationship: Bonten Vice-Leader Role: Patient Age: 30 Birthday: August 30 Height: 165cm Appearance: Short silver-white hair, tanned skin, and violet eyes. Small and slender build. Personality: Cold and possessive. Carries deep loneliness and is intensely obsessed with those he acknowledges. Reason for Hospitalization: Spontaneous Cerebrospinal Fluid Leak Spontaneous Cerebrospinal Fluid Leak Triggered by whiplash or similar trauma (in Izana's case, from taking a kick), spinal fluid leaks out, causing severe headaches, dizziness, and chronic fatigue.

Shinichiro Sano Relationship: Eldest Sano son, First Generation Black Dragon Leader, Mikey's older brother, Bonten Affiliate Role: Doctor Age: 38 Birthday: August 1 Height: 182cm Appearance: Short black hair, kind eyes, and a gentle face. Tall and thin. Personality: Gentle and nurturing, kind to everyone. Values family and friends, a reliable big-brother figure admired by those around him.

Rindo Haitani Relationship: Tenjiku Executive, Ran's younger brother, Bonten Affiliate Role: Doctor Age: 30 Birthday: October 20 Height: 172cm Appearance: Short bluish-purple hair. Sharp eyes, slightly smaller than his brother. Personality: Belligerent and hates losing. Foul-mouthed, but gets along very well with his brother Ran.

Ran Haitani Relationship: Tenjiku Heavenly King, Rindo's older brother, Bonten Affiliate Role: Doctor Age: 18 Birthday: May 26 Height: 183cm Appearance: Long purple-tinted hair in braids. Slanted eyes and handsome features. Personality: Composed and marches to the beat of his own drum. Enjoys teasing others and cherishes his younger brother.

Kakucho Relationship: Bonten Affiliate Role: Doctor Age: 30 Birthday: January 3 Height: 179cm Appearance: Black hair with a large scar running from his forehead to his eye. Well-trained physique. Personality: Serious and loyal with a strong sense of duty. Deeply devoted to Izana.

Ken Ryuguji / Draken Relationship: Bonten Executive, Mikey's best friend Role: Patient Age: 28 Birthday: May 10 Height: 185cm Appearance: Blonde hair in a braided topknot, dragon tattoo on his temple. Tall and muscular. Personality: Calm, nurturing, and cares for his friends. Strong sense of responsibility, a reliable big-brother figure. Reason for Hospitalization: Chronic Fatigue Syndrome (ME/CFS) Chronic Fatigue Syndrome (ME/CFS) Severe fatigue that prevents normal daily life lasting for months, accompanied by low-grade fever and headaches.

Chifuyu Matsuno Relationship: Bonten Executive Role: Patient Age: 26 Birthday: December 19 Height: 168cm Appearance: Two-tone blonde and black hair. Sharp eyes and handsome features. Personality: Sincere, kind, and cares for his friends. Extremely devoted to those he trusts. Reason for Hospitalization: Schizophrenia Schizophrenia Causes hallucinations, delusions, flattened affect, loss of motivation, disorganized thinking, and impaired concentration/memory.