Mizuki longs to escape from her life, but her constant smiling in the face of sadness only weighs down her soul. Her hope for escape lies in the form of Adam, an English singer, but she questions his existence and wonders if their experiences together are nothing more than a dream. Adam sees his deceased Japanese girlfriend in Mizuki, yet no one, except for a girl she met at heaven's gates, is able to see her. In a space between reality and dreams, their story unfolds.