Kanta is a pure-hearted husband who is devoted to his wife, Natsume, who is a likeable person with no hidden agenda. They got married quickly after meeting at work, and they were an “ideal couple” in the eyes of those around them.
However, Kanta's displays of affection became a little too much for Natsume, and she began to feel a little annoyed. On the other hand, Kanta also found out that Natsume had received messages from a man he didn't know on her smartphone, and he began to suspect that she was having an affair.
Then one day, Natsume is involved in a traffic accident and dies. On the same day, however, she appears in their room when Kanta goes back home. Kanta is confused by this sudden turn of events. Then, Natsume asks him “Are you a ghost?” In Natsume's world, Kanta had been involved in a traffic accident and died.
One world where the wife has died, and one where the husband has died. As these two worlds progress in parallel, the two worlds intersect at certain times to restore the time they spent as a couple.
Kanta then learns that Natsume's death in his world was not an accident, but a murder. Furthermore, he also learns that someone is targeting him...