The loyal canine, Tetsunoshin, accompanied the Inuyama Family as they shifted from Kyushu to the renowned Hoppongi Hills, which was modeled after Roppongi Hills. Rumi Inuyama's father, who owned a well-established IT company in Japan, was striving to reach the pinnacle of success. However, the extravagant spending habits of the family had put their entire company at risk of bankruptcy, as they had borrowed a fortune to secure their luxurious home in Hoppongi Hills. Sensing the urgency of the situation, Tetsunoshin realized he had to take severe measures. He sought help from the Hills Dogs, promising to go to any extent to settle the Inuyama Family's debts.