Below is a walkthrough for the W. Crossbell Highway Monster Extermination support request in The Legend of Heroes: Trails from Zero.
Client: State Government
Salary: 2000 mira
Exit Crossbell via the western exit on West Street to enter the West Crossbell Highway. Make your way to the 4th area. Approach the bus stop there to find a large monster prowling around. Choose to exterminate it to begin a fight against Nepenthes G. Defeat the three of them to complete the quest. Make sure to report it at the terminal!