It can be obtained from the enemy in the Field of Flower (west). It's just below the Mahoro Village.
Tsukumon
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Hi.
Is this about the story after visiting the lighthouse in the beginning? If so, to reach the lake, explore the forest in the bottom center of the map and find the location "Hidden Path." If you're talking about the lake from Yuga's event, it has been added around the right of the Shura village in the map.
Every month, 2-3 CGs are added, and one of them is posted as a video preview on X: https://x.com/TTsukumon
You must have passed through the forest before going to the lake.
*spoiler*
When exploring in that forest, there is about a 10-20% chance of encountering a werewolf. If you fight him without running away, you will have a conversation with the werewolf after the battle, and if you choose the correct option, Marco will join you.