SOA, BLUE, ECO, JOSHUA. The retro-style Side Scroller shooting game with vivid storyline depict their own stories of four fully charactered protagonists!One day, a mysterious vortex emerges in the city center!Each of selected character would follow different storylinesYou won't miss the reality of incident as game stage progresses more. Features: Various charactered protagonists with their own interesting storylines. Game Stages decorated in various themes and challenging boss infests. Each hero is equipped with multiple and original attack skills.