A girl gets thrown into a different period of time. While there, she is sacrificed and becomes the water god's bride, meanwhile the child she befriended while there vows for revenge against the water god as well as his own mother who sacrificed her.
There are two different worlds; the one that's real, and the one that leads our main character to "the perfect path"
There are two worlds. When a murderous stuffed animal comes into the world, time stops. Some people can still move around during that time. Anyone that the stuffed animal kills, when time is released and back to normal, the person shows no physical trauma but just suddenly is found dead.
I guess there are two worlds? The world of the humans and those of the mermaids who live in the ocean.
The world before he reincarnated and the one after.
Dream world vs non-dream world
Suijin no Hanayome