"I love you," he said, embracing my sister in a trembling, choked voice.

Arianna Reils risked her life to save her lover, but upon his return from the brink of death, her lover Sirius confessed his love to her 'sister,' Roselia.

Her lover, Sirius Lintvurm, the Second Prince of this country and commander of the First Order of Mages, was afflicted by 'Dragons' Blight,' a disease unique to the royal family who inherited dragon blood.

To save Sirius, Arianna Reils, the vice-commander of the First Order of Mages, received a royal command to retrieve 'dragon scales' necessary for treating Dragons' Blight, and headed to the 'Dragon Valley,' where dangerous monsters roam.

In her 'first life,' she couldn't save either Sirius's life or her comrades' lives.

However, in exchange for her life, she was granted a second life by a 'dragon.'

Arianna swore to herself that 'next time' she would definitely save them, and after several months, barely managed to bring back the scales with her life, but his love was directed towards her sister.

Lady Roselia Reils, the peerless 'Saintess' beloved by white magic.

She was Arianna's beloved older sister, the only one who had been kind to Arianna, who was scorned by her parents and relatives for lacking the Reils family's unique talent for white magic, but Arianna couldn't honestly offer her blessings.

Furthermore, Arianna, banished from the country by her father, heads to the Dragon Valley to fulfill the 'promise' she made to the dragon when she received her 'second life.'

Little did she know that on the very day Arianna left, the royal capital had been attacked by monsters.

――Several years later, his younger brother appears before Arianna, who is living with the dragon, saying, "Brother Sirius needs you," and tries to take her back to the royal capital, but...――.

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From Media Works Bunko, Volume 1 is scheduled for release on September 25th!

*Ranked #1 on the daily overall ranking on June 20th and 21st!

Thanks to everyone, a book and comic adaptation have been decided!

Details will be announced as soon as information is released.

*The subtitle has been changed due to the book adaptation.