Original Work: Oreco Tachibana, “Firefly Wedding” (Published by Shogakukan under the MangaONE Comics label)
Director: Takahiro Kamei
Series Composition & Script: Yuko Kakihara
Character Design: Yukiko Aikei
Music: NOGRID
Animation Production: david production
Ending Theme: TOOBOE – Yumegokochi

Satoko Kirigaya (VA: Lynn)
The daughter of the Kirigaya family, an aristocratic count’s family. Her mother passed away, and she now lives with her father, stepmother, and half-sister. She is physically frail, and her doctor has told her she does not have long to live. For the sake of her beloved father, she dreams of marrying into another prestigious family and protecting the Kirigaya family. She works hard to gain the education and refinement needed for marriage, and beneath her gentle appearance lies a strong will.

Shinpei Goto (VA: Koki Uchiyama)
A young man born on Celestial Maiden Isle who makes a living as an assassin. Mitsueda hires him to kill Satoko. He is fiercely devoted to those he takes a liking to but is equally prone to jealousy.

Kotaro Ogawa (VA: Kent Ito)
Satoko’s childhood friend and bodyguard. He supports Satoko’s dreams.

Miwako Kirigaya (VA: Hika Tsukishiro)
Satoko’s half-sister. She is attractive but tends to neglect her lessons and studies. She regards Satoko, who is popular as a potential bride, as a rival.

Rie Kirigaya (VA: Haruhi Nanao)
Satoko’s stepmother. She believes Satoko is getting in the way of Miwako’s marriage.

Jubei Kirigaya (VA: Kazuhiro Yamaji)
Satoko’s father. He is the only person in the family who is on Satoko’s side. He wants Satoko to marry into a prestigious family where she can receive proper treatment for her illness with sufficient support and protection.

Mitsueda (VA: Kenjiro Tsuda)
A yakuza from Celestial Maiden Isle who is hired by someone to kidnap Satoko. He will stop at nothing when money is involved, but he also has a compassionate side.