![](https://image.tmdb.org/t/p/original/4pACMMNeGS1RU0iytVCDEsYtYsE.jpg)
![](https://image.tmdb.org/t/p/w200/A4qBw6tyDh2if1nw9fGoL2Y63xA.jpg)
Two kids, fourteen-year-old Eriko and her thirteen-year-old brother Daigo, suddenly find themselves trapped in a parallel universe. Most things are the same as in their own world, but their parents are missing from home and are only contactable when using one particular phonecard.