Kōnosuke Minoda, known as Kō-san, is the longtime handyman and employee at Harunoya Inn. His duties focus on maintenance, repairs, and upkeep, essential for keeping the inn running smoothly. He forms part of the core team supporting proprietor Mineko Seki, working closely alongside fellow senior staff member Etsuko Tajima.

Kō-san possesses the practical skills vital for the inn's daily operations, routinely handling physical tasks and technical issues. His role extends beyond labor; he actively embodies Harunoya's foundational principle of rejecting no guest, fostering its welcoming atmosphere. This philosophy directly shapes his supportive mentorship of Oriko "Okko" Seki, Mineko's granddaughter, as she trains to become a junior innkeeper.

He contributes to Okko's growth through guidance and hands-on assistance. A key example is his collaboration with her to create the "hot bath" pudding, a dessert inspired by the hot springs, intended to comfort a grieving young guest named Akane and his father. Kō-san's involvement in this endeavor underscores his role in facilitating Okko's developing understanding of hospitality and empathy.

Within the inn's community, Kō-san's relationships with staff and guests reflect his reliability and steady presence. His consistent portrayal emphasizes unwavering dedication to Harunoya's values and his supportive mentorship of Okko as she learns her responsibilities.