Warriors of the Ruins Monster Farm: Enbanseki no himitsu : Season 1 Episode 25

The Searchers come across a small, quiet lake in the forest. They decide to restock their food supplies with fish. However, the lake has another inhabitant, an Undine. Golem falls in love with the beautiful water spirit, but she turns out to be a servant of Moo. Will he be able to defeat her?