Himeru Kangoshi works part-time as a nurse at a mental clinic. She hails from the Kangoshi family, positioned as the middle daughter between her older sister, Iyashi Kangoshi, and her younger sister, Asuna Kangoshi. Her grandfather is Sukizō Kangoshi.

She possesses chin-length dark brown hair and magenta eyes, often depicted with a blushed complexion. Her standard outfit is a nurse uniform. Visually distinctive moments show her covered in sea cucumbers or wearing a sow mascot headpiece during bouts of nervousness.

Pronounced shyness, nervousness, and introversion define Himeru's personality, marked by significant social and general anxiety that create daily challenges. This anxiety compels her to frequently seek guidance from the clinic's psychologist, Ryō Shinnai, discussing disorders and personal problems despite her nursing role.

To manage her anxiety and shyness, Himeru employs cosplay as a coping mechanism, specifically utilizing the sow mascot headpiece to conceal her face during intense nervousness.