Hello Sakisaki,
Thanks for reaching out. I can feel your excitement about setting up your Chromecast device. To confirm, is this a first-time setup? Have you made any recent changes to your router settings? Which device are you using to set up your Chromecast (Android or iOS)? Also, what language is set on your setup device?
I recommend using a different phone or tablet to set up your Chromecast device, and make sure to set the device language to EN_US. If you still have the same issue, please try connecting your Chromecast to a different network, such as a mobile hotspot, to see if your device will have the same behavior.
Let me know how it goes.
Cheers,
Muddi
