Males are red and females are black and yellow. This specimen may well be a hybrid between S. eroticum and S. baccha matutinum. They commonly interbreed and this would explain the dark wingtips (found in S. baccha matutinum).
Sympetrum eroticum eroticum
Dragonfly = mayutate-akane-tombo
Location: Fields/ponds next to Anzunosato Park near Tsuyazaki (Google map)