Hiromi Hongo serves as a clerk at Okashidokoro Mikazuki, a Ginza confectionery shop renowned for traditional Japanese sweets. Alongside selling wagashi, she innovates new recipes, though her experimental concoctions occasionally trigger peculiar, unpredictable reactions upon consumption, sparking cautious intrigue among patrons. Her cheerful disposition and genuine warmth, however, solidify the shop’s charm, drawing customers who relish both her hospitality and the establishment’s inviting atmosphere.

As part of the Imperial Combat Revue’s Moon Division, Hiromi partners with Itsuki Saijo on missions, balancing curiosity with tactical focus. During one covert operation surveilling a target group at a social gathering, she briefly crosses paths with adversaries Valery Kaminski and Leyla, pausing to note their vague familiarity before resuming her duties. Her mission conduct reflects a blend of professionalism and playful pragmatism—prioritizing team cohesion and measured action over reckless ventures.

Rooted in tradition, her name hints at meanings tied to beauty and generosity, while her surname evokes “origin” and “hometown,” mirroring her connection to cultural heritage. Her personal history remains private beyond her dedication to the confectionery craft and community service.

Following pivotal events like Kaminski’s demise, Hiromi’s presence endures within the group’s endeavors, seen navigating Tokyo’s streets in the aftermath—a subtle testament to her steady role amidst shifting circumstances.