A distinct cultivar of Petunia plant named Kirimaji Double Rose, characterized by its cascading and prostrate plant habit; freely branching growth habit; early flowering habit; red purple-colored semi-double flowers with brighter red purple-colored venation; and good weather tolerance. A notch is to be provided at a portion of the injector end so as to form a coarse-grained portion and a dense portion in sprays of fuel, and the injector is disposed so that the coarse-grained portion is directed towards the ignition plug. Whether the driving TFT is normal or not is judged by the observation, so that the rejects can be removed before the manufacturing process is completed. Instances of the extension construct are directly or indirectly associated with exactly one instance of the base construct without impacting the behavior and functionality of the base construct.