Cosmic Star Heroine

MISSABLE

In Gehenna you will find a guy leaning up against a wall next to the shop. Talk to him and he will ask you to scare all the rats away. There are four in total. Locate them (they are all near the shop) and run at them to have them run off. Once all four have been scared away, go back to the same guy and speak to him again. This will unlock the trophy.

See video for more detail.