The protagonist is reincarnated as a vampire.

However, though born into a noble family, her mother is one of the concubines, and their treatment is far from favorable.

Isolated in a dilapidated mansion with her mother, it's clear they will eventually be cast aside if things remain as they are.

Currently, she can barely get by thanks to her succession rights, but the family will undoubtedly be inherited by the main wife's child in due time.

She cares little for that particular matter, but she must, at the very least, prepare to survive on her own when the time comes for her abandonment.

Fortunately, dungeons exist in this world, along with a profession called Seeker, dedicated to exploring them.

Therefore, her objective is the complete conquest of these dungeons.

To delve into dungeons, accumulate wealth, grow stronger, gather companions, and then delve once more.

Recalling a previous life lived without purpose, merely existing to survive, and ultimately ending in an unfulfilling death, Mercedes Grünewald's resolve hardens.

"It's precisely because this is my second chance. To live without regrets, and to die with a smile. That is the kind of life I want to lead."

This is the story of a crescent moon blooming into a full moon, a tale of her journey until she ends her life with a smile.