Story

Houjou Tatsumi is a yumegari. Kaga Kyousuke is her yumemori. Together they carry out the work of the Houjou Clan: investigating and interacting with the dreams of other people. The Houjou Clan of Shinshuu is the only family in Japan that possesses the power to be yumegari, thus only a few of such people exist.

A yumegari ("dream hunter") has the power to enter the dreams of others and take an active part in them, sometimes battling obstacles harmful to the mind of the dreamer. However, yumegari do not work alone. A yumegari is destined to be with a yumemori ("dream watcher") with who dreams are shared, though yumemori cannot enter dreams themselves. Their job is to make sure the yumegari do not become engulfed and lost within the dream they have entered.

3 months ago, Tatsumi's mother died. The night she died, she visited Tatsumi in a dream and introduced her to Kyousuke, her destined yumemori. With only the name and address her mother had given her, Tatsumi went to Tokyo and found Kyousuke. They have been living and working together ever since.