The Inuyama Family, accompanied by their loyal dog Tetsunoshin, relocates to the prestigious Hoppongi Hills from Kyushu. Mr. Inuyama, Rumi's father and owner of a thriving IT company, is on the brink of a major breakthrough. However, Tetsunoshin uncovers a troubling secret: the family is drowning in debt from their lavish lifestyle in Hoppongi Hills, jeopardizing the entire company. Determined to assist, Tetsunoshin joins forces with the Hills Dogs, embarking on a mission to alleviate the Inuyama Family's financial burdens at any cost.