Here is an overview of the game, via Beep Japan:
Radirgy is a vertical scrolling shoot ’em up game that first appeared as an arcade game title in 2005. With the catchphrase “toon pop radio wave shoot ’em up,” the game later appeared on a variety of home video game consoles and gained popularity.
Radirgy 2 is a new, greatly evolved the shoot ’em up game. This evolutionary version of the game features the catchphrase “radio wave shoot ’em up re-proposed.” The “Murasame,” the player’s own machine, evolves in various ways to help the player.
Watch the trailer below.