Angelian Trigger is a 3D shooting game in which you run through the screen while shooting down enemies.

Wati is a large city on the planet Galadsik where the Eames Detective Agency is located. While the agency is facing financial difficulties due to an influx of small cases, like investigating infidelity and finding missing pets, a request comes in from an anonymous client to investigate the green planet Sarius. Despite the unsettling indicators, such as Sarius being under the control of the Planetary Industry Minister Wizria and the client being anonymous, Mia and Sheryl take off to Sarius. This was the trigger that led them into a major conspiracy.