Dark Rose Valkyrie
"Defend humanity from the Chimera virus as the new leader of the Japanese secret organization ACID in Dark Rose Valkyrie! In this action-packed real-time role-playing game written by "Tales of" scenario writer Takumi Miyajima and "Tales of" character designer Kosuke Fujishima, you'll fight enemies that change shape and strength when darkness falls. But that's not all: there's a traitor in your midst! Use a visual novel interview system to figure him out and strengthen the Valkyrie Force to save the world!"
Story
"1929 - It was the year of the outbreak. In masses, normal people turned into inhuman creatures called chimeras. The cause: a mysterious virus brought to Earth by a meteorite called Black Garnet, which had crashed there long ago. In its initial stages, the Chimaera virus would wipe out 3% of the entire world's population. In a national emergency, Japan became a closed nation to ward off the pandemic. A covert military unit called ACID was formed to combat the remaining chimeras in the country. Time passes. ACID creates a special unit called Special Force Valkyrie to eradicate the Chimera that threaten humanity to this day."