Lots of dragonflies (J: tombo) out and about yesterday as well. Here are two species of damselfly (smaller/thinner) and one true dragonfly.
The blue one looks like a ruler so in Japanese it’s called monosashi-tombo i.e. “ruler damselfly” (it’s a male). The brown one is a female monosashi-tombo. The one with black wings is called haguro-tombo i.e. “black-winged damselfly”. The final picture is an almost-impossible-to-photograph flying Golden-ringed dragonfly (J: oniyanma), which never seem to keep still.
monosashi-tombo = Copera annulata
haguro-tombo = Calopteryx atrata
oniyanma = Anotogaster sieboldii (probably)