His girlfriend was cheating with a friend. Devastated, Hajime was approached by Mary, a novelist who lived in the room next door. They ended up having sex after Mary offered comfort. Over the three days before his girlfriend returned from her cheating trip, their distance rapidly closed, engaging in conversations and sex like a couple. However, their world remained separated by a door. One different choice could have led to another possible life. With every choice, countless versions of his girlfriend exist - the multiverse (multiverse) x Meari Tachibana, finally opening. *Please note that the recorded content may differ depending on the distribution method.*