The Streetlamp World is an area accessible from the subway passage in the Ancient Ruins.
The Streetlamp World is a grassy field filled with scattered streetlamps. The area also has some brick paths partially covered by grass, which could be used for navigation.
When the area is entered from the stairway in Ancient Ruins, Sometsuki starts on a rectangular tile section of the world. If the player heads south of the vending machine on the stone tiles and then heads southeast once they encounter their first streetlamp, they will find a particularly short streetlamp which will give Sometsuki the Street Lamp effect upon interaction.
Shortly east of this short streetlamp is another streetlamp with a different size, this time being noticeably taller than the other streetlamps. Interacting with this tall streetlamp leads to an isolated island in the Countryside.
The Nexus → Ancient Ruins → Streetlamp World