A game The Alliance Alive HD Remastered takes place in a fantasy world. A thousand years ago, the human world was invaded by monsters who enslaved humanity and set up the Great Barrier to separate the worlds. As a result, the planet was practically destroyed. From a worldwide cataclysm, the Dark Current was born, sweeping across the world, dividing it into four regions, swallowing up countless cities.

Humanity was destroyed, and the few survivors that remained were isolated from each other. Several centuries have passed since then. Demons rule over a stratified world, divided into several administrative zones, each with its own culture and climate. The nine main characters are members of the Night Ravens, a human resistance group who fight monsters and strive to return control of the world to humanity. Now the fate of the planet is in their hands.

Among the main characters of The Alliance Alive HD Remastered:

• Galil is a young man with a good character;
• Azura is a cheerful adventurer who often drags Galil along on her adventures;
• Renzo is an optimist with a wealth of knowledge in various fields;
• Barbarossa is a monster soldier who swore allegiance to Azura's father after he saved his life;
• Vivian is a historian and the daughter of a demon lord;
• Ignace – Vivian's demonic butler;
• Tiggy is a girl who studies the Dark Current;
• Jin is a man who acquired magical powers through connections with demons;
• Rachel is a kind-hearted mercenary.