Matsuki Akino, heir to the prestigious Shuukou Lodge, is groomed by her grandfather to inherit the family business, positioning her as a natural rival to the protagonist’s modest inn. Flaunting a haughty demeanor, she openly disparages their establishment as inferior, boasting of her lodge’s modern luxuries—open-air baths, frequent renovations—while meticulously studying hospitality management. Her appearance mirrors her privileged life: twin pigtails tied with pink bows cascade over her long black hair, paired with a frilly pink lolita dress imported from Ginza and sharp gray-blue eyes. Peers mock her ornate style as “Frilly Pink,” a nickname underscoring her isolation, exacerbated by her bookish pretensions and cold elegance.

Beneath her rivalry lies vulnerability tied to her late sister Miyo, a ghost who bonds with the protagonist. Miyo’s spectral presence quietly exposes Matsuki’s ache for the sibling she never knew, tempering her abrasive facade. Though she mocks the protagonist’s inn, her expertise surfaces when advising on dietary-restricted menus, reluctantly bridging their animosity.

Her evolution peaks when she volunteers to host the Kise family—linked to the protagonist’s tragic past—and joins the protagonist in a Shinto spring festival ritual dance. This synchronized performance, echoing the story’s opening, cements their truce. Once a pampered antagonist clinging to legacy, Matsuki emerges as a nuanced ally, balancing familial duty with newfound empathy. Her journey intertwines grief, rivalry, and reconciliation, framed by supernatural ties and the quiet ache of inherited expectations.