With Vengeance, Sincerely, Your Broken Saintess

The story takes place in the kingdom of Zied in a fantasy world. Rua, a baron's orphaned daughter, grew up in a temple to become a candidate for the rank of Saintess, a title founded by a legendary healer in the past, but her healing powers have a vital flaw: She can only heal others by taking their hurts and ailments upon herself. Maligned and ridiculed by the other inhabitants of the Temple, her best friend Arianne seems to be her only supporter. When her crush, Garrett Vance of the Royal Knights, is critically wounded in a fight against a demonic beast, Rua heals him but collapses from the pain. When she recovers, she is devastated to learn that Arianne has taken credit for saving Garrett's life, is set to marry him and become the Temple's new Saintess, a position which has been vacant for ten years after the previous Saintness' demise. When the people continue to unjustly deride her, she begins using her powers to hurt them back, revelling in seeing them suffer the same way she did.

Her despair is noted by Sven, the second prince of Zied, and he recruits her for his cause. As he informs her, the Temple's High Priest is conspiring to unleash an artificially made, near-incurable disease against the kingdom's people. By having his sponsored Saintess Arianne heal the infected, he intends to increase the Temple's (and thus, his own) public support and then eventually seize rulership for himself. After catching the High Priest and Arianne at a clandestine meeting, and thus confirming Sven's accusations for herself, Rua joins his plan to stop the conspiracy before it gains momentum in order to get revenge on her malefactors.^[1]

Rua Restoat (ルーア・レストアット, Rūa Resutoatto)

Voiced by: Asami Seto^[2]

The main protagonist. A 17-year-old noblewoman of Zied, she manifested healing powers like any potential Saintess, but with the disadvantage that in order to heal others, she has to take their sufferings upon herself, a trait she inherited from her mother. After her family died, she was taken in by the Temple of Luche, Goddess of Healing, where she was known as the "Broken Saintess" for her flawed ability.^[1] Shattered after healing the love of her life, only to be betrayed by her supposed best friend, she starts inflicting all the pain she has suffered on those who hurt her.

Sven Zied-Crown (スウェン・ジード＝クロウン, Sūen Jīdo Kuroun)

Voiced by: Soma Saito^[2]

The second prince of the kingdom of Zied. He has a romantic interest in Rua. ^[1]

Arianne Treviers (アリアン・トレビアーズ, Arian Torebiāzu)

Voiced by: Momo Asakura^[2]

A young noblewoman and Saintess candidate. She is Rua's former best friend who betrayed her.^[1]

Cezee Rubin (シジー・ルビン, Shijī Rubin)

Voiced by: Kazuyuki Okitsu^[2]

Sven's loyal aide and friend. He grew up as a street urchin, and was saved by Sven. Stoic and soft-spoken, he is very popular with the ladies.^[1] He becomes Rua's personal bodyguard at Sven's request.

Garrett Vance (ガロット・バンス, Garotto Bansu)

Voiced by: Kazuki Ura^[2]

The young captain of the Royal Knights and a renowned hero of Zied. He is the son of the previous commander of the knights. He wishes to make his father proud.^[1]

Sarid Zied-Crown (サリッド・ジード＝クロウン, Sariddo Jīdo Kuroun)

Voiced by: Tomoaki Maeno^[3]

The first prince of Zied, and Sven's older brother. He is known as the "Ice Prince" but shares warmer feelings for his fiancè Diana.^[1]

Diana Peridot (ディアナ・ペリドット, Diana Peridotto)

Voiced by: Minami Tsuda^[3]

Diana is the daughter of a highly influential noble house close to the crown, Sarid's fiancé and the future queen of Zied.^[1]

Luis Riston (ルイズ・リストン, Ruizu Risuton)

Voiced by: Reiō Tsuchida^[3]

A bespectacled young man from a country to the east. He is the eldest son of an influential merchant family. He is a skilled tailor and baker; Sven likes to tease him by calling him Apple Glasses Guy (リンゴメガネくん, Ringo Megane-kun).^[1]

Charlotte Mayle (シャーロット・メイル, Shārotto Meiru)

A young woman who worked for Ross Dedmond's family as a maid. After becoming betrothed to her childhood friend Alan, a baker, she intended to quit her job at the mansion, but was raped by Ross; when Alan confronted the viscount, Ross sabotaged his business and had Charlotte dismissed.

Lynn Partis (リン・パーティス, Rin Pātisu)

A farmer's son who early on demonstrated an innate talent for making medicine. He became Rosen Shroud's apprentice.

Yumia Treviers (ユミア・トレビアーズ, Arian Torebiāzu)

Arianne's older sister. She later married off by her parents to the Hennety clan, a noble family from the Southern Islands, where her husband proved kind and accepting.

Mary (メアリー, Mearī)

A young new serving maid at the Temple who was the only witness of Rua's healing of Garrett.

Regiel (レジエル, Rejieru)

The new royal chancellor who replaces his predecessor, Chancellor Sandra, after his daughter Nerne was caught trying to kill Rua. Born into a low-ranking noble family, and despite his youth, he was sponsored by Diana because of his skill needed for his new position. After the High Priest's fall, he is appointed the Temple's administrator.

Flix Ron-Hearts (フリックス・ロン・ハーツ, Furikkusu Ronhātsu)

Voiced by: Nobuo Tobita

The High Priest of the Temple of Luche. He secretly plans to seize rulership over the realm, using a Saintess he can control as a puppet figurehead.

Rosen Shroud (ローゼン・シュラウド, Rōzen Shuraudo)

Also known as the Mad Scientist, Rosen Shroud is a former pharmacist for the Zied royal family. He was banished for conducting heinous experiments on healing methods, including the Saintesses' healing power. After his exile, he was secretly employed by the High Priest for his treasonous plot.

Assistant High Priest

Voiced by: Ryoma Masuda

A junior priest at the Temple and Flix's Ron-Hearts' personal assistant. He is the High Priest's confidant in the conspiracy despite his weak nerves.

Ross Dedmond (ロズ・デドモンド, Rozu Dedomondo)

Voiced by: Kohsuke Toriumi^[3]

A red-haired, handsome nobleman of Zied, and one of the High Priest's fellow conspirators. He is a skilled orator and diplomat. Despite having a wife and son, he is infamous as the "Womanizing Viscount" for his hedonistic acts of adultery.^[1]

Nerne Sandra (ナーネ・サンドラ, Nāne Sandora)

The daughter of Zied's chancellor, a Saintess candidate and former Rose Princess. She is a loner who believes that she and Sven are soulmates.

Marquess Santalua (サンタルーア侯爵, Santarūa kōshaku)

A middle-aged nobleman who is part of the High Priest's conspiracy. He once supported Rosen Shroud until he realized his true agenda. Santalua is blackmailed by Rosen Shroud.

Luche (ルーチェ, Rūche)

A legendary healer who centuries ago saved Zied from a plague and became the first Saintess of the realm, and later the realm's Goddess of Healing. She is known to have adored roses and playing piano, which caused a Rose Princess holiday to be established in her honor.

The Yuan Tribe

An ethnic minority living in the west part of the continent where Zied is located; hence they are also known as People of the West. They have developed techniques of controlling the demonic beasts living in the wild, and are therefore persuaded by the High Priest in assisting him in his plot.

Lewitt (ルウィット, Rū~itto)

A stray cat living on the palace grounds, who was taken care of by Cezee. The cat attaches itself to Rua. She later names it Lewitt, after her deceased younger brother.