In a world gripped by an unprecedented metal pet boom, a man named Todoroki finds himself unexpectedly responsible for the care of an M4 Sherman tank. For reasons not fully disclosed at the outset, he must adjust to the challenges of living with a full-sized armored vehicle as a companion. The story follows his daily struggles with this unusual two-person household, from the practical difficulties of maintenance and space to the awkwardness of sharing his life with a machine that behaves more like a pet than a weapon. What unfolds is a heartwarming and comedic slice-of-life narrative centered on the bond between one person and one vehicle, exploring the humor and tenderness that arise from their unlikely coexistence.