Taking place in the future, research on male pregnancy is underway to halt the decline in population. Nagisa Fuyumi, who had been forced to become a test subject even though he did not wish to become pregnant...

Sung-jun is a young man working at a pet café for mostly abandoned animals. He one day runs into a seemingly abandoned dog on his way home from work. Sung-jun adopts the dog and names him 'Tan', not knowing how...