The mermaid house is made of corals. It's very colorful and pretty. They can rest well there, eat some seafood (but they do have fish-free food too). The mermaid will talk about some problems they've recently had with Sirens attacking, but otherwise things have been peaceful according to them.

For staying for the sleepover, the mermaid gives Saya a bracelet that makes her able to use fire magic in water. It's a special amulet the mermaids have been making for Summer power holders for a long time. The fire made when the bracelet is worn will burn for a good while, despite the water. She can keep it completely after their adventure and they welcome them to stay another night on their way back up.

The journey down continues with things getting darker and darker. Eventually the reach the depths of the lake where a humongous whale resides. There's however a sense of danger to be felt around the place. Like something is lurking in the shadows. Though it feels like it comes from a different direction from the whale.