Office worker Tsuchiya Reno was spending an unfulfilling day at work. When she returns home after working overtime as usual, she finds that the bathroom door is connected to a world she has never seen before! There was a vast land, mysterious flora and fauna, kind and pure people ......, a scene that had never existed in Reno's world. Luno becomes friends with a girl who is considered to be a princess there, and begins to live a life that moves back and forth between here and there... A mysterious world and a mysterious girl appear next door. This is a story that will cheer up your tired life.