By Day and By Night | 2009
A scientist narrates his diary. On planet Earth, the near future faces over-population. People are divided into two groups: one that is only active during the day and another that is only active at night. Both of which live in an artificial space called "Metropoli". A female doctor in the day group named Sarah finds that her missing daughter has become an illegal citizen of the night group, but there is no way for them to meet again.