uhhhh I’ll try to give a real answer
Dennou Coil is an anime set 11 years after something similar to google glass has taken off like an ipod but the resulting show is kind of like if you crossed a ghibli movie with digimon.
Basically when the glasses are put on a digital world is overlaid on the real one. You can have digital pets to play with, you can get codes to effect the environment but there are also bugs called “illegals” like that fish is that come from an older version of the cyberspace.
There is a rumor going around that there is a special kind of glasses that you can control with you mind and it’s somehow connected to the old cyberspace, and possibly connected to some kids going too far in and getting disconnected from their bodies.
The story basically is solving the mystery of what really happened and how the things are connected but the only way to find out is to go in the space themselves.
and then there is sad dog
Sad dog is very important to the story