You can find the Wi-Fi Network Name (SSID) and Password (Encryption Key) on the label attached to the router unit in your room.
1. How to find the Password (How to read the label)
Please check the sticker on the side or bottom of the router. While the terms may vary depending on the model, the alphanumeric code listed next to any of the following labels is your password:
暗号化キー (Encryption Key - Most common label in Japan)
暗証番号 / KEY
Password / PSK-AES
SSID-Key
2. Router Location
The setup varies depending on the property type:
External Router: Located behind the TV stand, on a shelf, or inside a closet, etc.
Built-in Wall Router: Installed directly into the wall. You may need to open the surface cover to see the label inside.