Hikari Jinguji, a former film club member who was senior to Sora Narukami, works at her family's ramen restaurant, Ramen Heavenward, owned by her mother. The restaurant faces severe financial hardship, prompting her mother to take a loan with crushing 30% monthly interest. When her mother falls ill, Hikari shoulders sole responsibility for running the restaurant while confronting relentless debt collectors.

Learning of Hikari's plight, Sora recruits her brother Yota and Hina Sato to intervene. They orchestrate a business revival: renaming the establishment "Fallen Angel," streamlining the menu by cutting non-essential items, and launching a marketing campaign built around the phrase "An angel has fallen!" to draw patrons. Yota refines the cold noodle dishes and stages a promotional interview to boost social media visibility. These strategies successfully attract large crowds, easing the financial burden and resolving the debt, with a physical confrontation against the creditor settled through strategic intervention.

Hikari possesses salmon-pink hair reaching her hips, styled in low twin fishtail braids—one resting behind her right shoulder, the other draped over her left. Her bangs partially obscure the left side of her face, complementing her blue eyes. Her surname, Jinguuji, combines the characters for "Shinto shrine" (神宮) and "officer" or "boss" (司).