Ichirou Inuyashiki is a 58-year-old family man navigating a difficult period in his life. While his frequent back problems are painful, they pale in comparison to the emotional toll of his wife and children's indifference and distaste toward him. Despite this, Ichirou finds solace in Hanako, an abandoned Shiba Inu he adopts. However, his situation worsens when a follow-up physical examination reveals he has stomach cancer and only three months to live. Although he attempts to remain strong, his family's disinterest triggers an emotional breakdown. Ichirou runs into a nearby field, embraces his dog, and weeps—until he notices a strange figure standing before him. Suddenly, a bright light appears, and Ichirou is enveloped by smoke and dust. Upon regaining consciousness, he realizes something is wrong: he has been reborn as a mechanized weapon wearing the skin of his former self. Though initially shocked, the compassionate Ichirou immediately uses his newfound powers to save a life, an act of kindness that fills him with happiness and renewed hope. However, the origins of these strange powers remain unclear. Who was the mysterious figure at the site of the explosion, and are they as kind as Ichirou in their use of this dangerous gift?