A Gift For My Beloved
Talk to Manny at Hateno Village. He is standing near a donkey. If you ask him what’s bothering him, he will ask if you can talk to somebody named Prima at the Ton Pu Inn.
Go to the Inn and speak with Prima. You have to talk to her directly instead of across the desk or else she will simply treat you as another customer. Ask her what she likes and she will tell you she likes crickets. Lots of crickets.
Report back to Manny. He will ask you to help him by fetching him 10 Restless Crickets. Probably the easiest way to gather up a ton is to just start cutting grass with a level 1 charged sword swing, then mash [A] whenever you see bugs appear. You can also find a bunch in Korok Forest.
Once you have caught 10, give them to Manny and he will give you a silver Rupee worth 100 Rupees for your trouble.