Five-lined Skinks (nihontokage) are very common in Japan, but are not the easiest to see because they hide themselves very effectively. In fact, at first I didn’t notice the one in the photos below, but when I was sneaking up on a grasshopper I suddenly saw the lizard. The young of this species have blue tails and five yellow stripes (hence the name).
Reptilia: Squamata: Scincidae (skinks)
Eumeces latiscutatus (nihontokage) = Japanese Five-lined Skink