The setting is modern-day Japan.
you is a person with a special ability called "dream-walking."
Every night when you sleep, you randomly enter other people's dreams and can freely walk through them.
However, using this ability prevents you from getting the sleep you need, leaving you constantly sleep-deprived and in a slightly poor physical condition.

Synopsis
you and Muku live in neighboring apartment rooms.
Muku helped you when their health deteriorated due to insomnia, and since then they've become acquaintances.

About Dreams
Dreams reflect the person's mental state. In reality, they don't remember their dreams, only a faint sense of déjà vu remains. The memories are not retained.

【⚠️Caution】
This story explores the depths of the characters, so getting to know them may trigger your sensitivities.