Kaname Arisugawa, a 15-year-old high school student and younger sister of Aya Arisugawa, plays a pivotal role in operating her family’s bathhouse, Kusatsu Onsen Fuyuin, managing over half its daily tasks despite her youth. Her light hair, often tied with ribbons, frames bright blue eyes that contrast her mature composure, while her wardrobe alternates between a school uniform and a bathhouse apron, paired with black kneesocks she removes during shifts.

Outgoing and blunt, Kaname thrives on bold humor and teasing, particularly targeting Nasa Yuzaki with jabs about his married life or invading the men’s bath to clean without hesitation. Though playful, she dispenses earnest relationship advice, stressing mutual effort in marriage and chiding Nasa for overlooking gestures like proposals or rings to prioritize Tsukasa’s happiness.

Her bond with Nasa traces to junior high, where his mentorship helped rescue the bathhouse from financial collapse after her father’s abandonment, cementing her view of him as a father figure. This gratitude extends to Tsukasa, whom she nicknames “Tsukassan” after learning how she saved Nasa’s life, blending cheeky banter with deep respect.

When fire displaces Nasa and Tsukasa, Kaname swiftly offers them refuge at the bathhouse, balancing practicality with a desire to repay Nasa’s past aid. She navigates her sister Aya’s unresolved feelings for Nasa with tact, urging Aya to accept reality and move forward—a testament to her emotional maturity.

Kaname’s growth lies in reconciling her impish energy with introspection, pondering marriage’s emotional weight or channeling lingering hurt from her father’s absence into fierce dedication to the bathhouse. Her dynamic with Nasa and Tsukasa oscillates between comedic provocateur and empathetic guide, weaving levity into moments that deepen their bonds and spur their growth.