Lurelin Village was taken over by monsters who are acting just like pirates.
Quest Location
To start the quest, talk to Bolson and Rozel at 2786, -3270, 0083, just west of Sifumim Shrine.
Get Rid of the Monsters
There are several groups of monsters in the area. They are far enough apart that you can deal with each group without being overwhelmed. They include Bokoblins, Lizalfos, and a Boss Bokoblin.
There is a lone Bokoblin in the Lurelin Well that you have to defeat in order to proceed.
After you defeat all of the monster forces, the quest will be complete, and you can talk to Bolson to start the Lurelin Village Restoration Project.