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Based on the popular Vocaloid song . Rin, a young angel (presumed female, but angels don’t have clear genders) falls in love with a young human girl, Miku. However, their love is considered taboo, and so, Rin makes a deal with the devil to be reborn as the human boy, Len, in order to be with Miku. However, their happiness together is short-lived, and even that soon ends in tragedy.
- Prologue
- Chapter 1, Part 1 — Apple
- Chapter 1, Part 2 – The White Angel
- Chapter 1, Part 3 – Meeting
- Chapter 2, Part 1 – The Girl in Black
- Chapter 2, Part 2 – Change
- Chapter 2, Part 3 – Seedling
- Chapter 2, Part 4 – Contract
- Chapter 3, Part 1 – Turning Gears
- Chapter 3, Part 2 – Beyond Affection
- Chapter 3, Part 3 – That Which Was Abandoned
- Chapter 4, Part 1 – The Laws of Heaven
- Chapter 4, Part 2 – The Price of Betrayal
- Chapter 4, Part 3 – Arrow of Judgment
- Epilogue
- Side Story 1 — The World Which He Loved
- Side Story 2 — The World Which He Left Behind
- Extra Story MISSION 1 — search for the song
- Extra Story MISSION 2 — let the song reach
