YM778.TV 
The story is about a boy entering high school, who answers a strange call from a public phone one night. The caller challenges him to a bet: She’ll remove the birthmark which he sees as the cause of so many problems, and he’ll have fifty days to win the heart of a girl he’d considered far beyond his reach. And with this, a very strange summer begins.
- Volume 1, Chapter 1: Cross My Heart and Hope to Die
- Volume 1, Chapter 2: Fleeting Summer
- Volume 1, Chapter 3: The Mermaid of Agohama
- Volume 1, Chapter 4: One Who Sees the Stars
- Volume 1, Chapter 5: The Ninth Comet
- Volume 1, Chapter 6: The Place I Called From
- Volume 2, Chapter 7: The Summer Triangle, or Square
- Volume 2, Chapter 8: Save the Last Dance for Me
- Volume 2, Chapter 9: Someone Else’s Name
- Volume 2, Chapter 10: Don’t Lose Sight of Me
- Volume 2, Chapter 11: This Is Just A Good Luck Charm
- Volume 2, Chapter 12: The Mermaid’s Song
- Volume 2, Chapter 13: The Place You Called From
- Volume 2, Epilogue
- Volume 2, Afterword
