Kenji Kiyosawa, a sports coach from Nagano, developed a keen interest in a model home known as Mahou no Ie, or "Magic House." This innovative house design requires only a single air conditioner to heat the entire home efficiently. Inspired by the concept, Kenji decided to build a similar house for his family, considering his wife's comfort and his daughter’s sensitivity to the cold. During the construction process, Kenji and his wife welcomed their second daughter. Eventually, the new home was completed, bringing their vision to life.