Below is a walkthrough for the E. Crossbell Highway Monster Extermination support request in The Legend of Heroes: Trails from Zero. You can pick up this request from the terminal in Chapter 2.
Client: State Government
Salary: 2000 mira
For this request, head to the East Crossbell Highway then ride the bus to Bus Stop (Fork). Once there, take the southeastern path towards Tangram Gate. Near the next map transition, you’ll find the Savage Horn. Approach it and select to exterminate it! Scan it then defeat the 2 Level 18 Savage Horns! After you defeat them, the quest will complete! Be sure to report it to the terminal.