Horizontal text in modern Japanese is virtually always written left to right.
The primary exception is where the context of the writing itself implies a direction, e.g. text on the passenger side of a bus, or on a directional sign pointing to the left, may be written right-to-left so that the text "flows" in the same direction as its container. This would never be used for a longer text, though.
The primary exception is where the context of the writing itself implies a direction, e.g. text on the passenger side of a bus, or on a directional sign pointing to the left, may be written right-to-left so that the text "flows" in the same direction as its container. This would never be used for a longer text, though.