Saint Dragon, or Tenseiryuu, is a side-scrolling shoot 'em up from NMK that features as its protagonist a cyborg dragon - the titular Saint Dragon. The dragon flies across the screen as a segmented creature, taking down other cyborg creatures that are still allied with the enemy. The player can collect power-ups that increase the dragon's firepower and speed.
The game was originally released for the Arcades in 1989 where it was published by Jaleco. It would be converted twice: The first for various North American and European home computers like the Atari ST, Amiga and C64, which was handled by UK developers The Sales Curve and publishers Storm (or Storm Entertainment). The second was a PC Engine port in late 1990 that was published by Aicom.