I often enjoy stories where the MC lacks normal human emotion as such things can be used to move the story along. Here however MCs lack of emotion because she is a vampire is used to make the story bland. Admittedly this was not the case until the second half of the book, hence the two stars. The story also lacks resolution.
The story (don't read if you are concerned about spoilers). MC is a young vampire girl. Her mother is a concubine to the vampire lord but concubines are not favored. This results in MC living in poor but paid for housing receiving poor but paid for food. In this world vampires are strong and fast and have high powered regeneration but can otherwise be killed just like anyone else. Therefore the vampire lord will eventually die and when that happens MC and her mother will be out on the street. To prepare for this MC, who remembers her prior life in Japan, begins training at a very young age. This results in MC joining the adventurers guild at 10 and likely being the most powerful adventurer in that branch of the guild.
The MC's power is largely ignored or overlooked as she adventures alone in the dungeon. On one such occasion MC encounters a rich trader who is the sole survivor of dungeon dive the trader financed to find good for his trading house. The MC saves the trader and sells him the recipe for chocolate which brings her a lot of money.
Later the MC is required to attend the house heir’s coming of age party where she avoids the lime light until a disgruntled relative releases a very powerful monster. Forced by circumstances to kill the monster the vampire lord (MC’s father) negotiates MC into becoming the new heir.
MC goes clothes shopping for her new role as heir with a half-sister. Half-sister is kidnapped but MC catches the kidnappers and the person behind the crime in a very public way. This results in MC getting a bunch of marriage proposals. The end except for the regret I feel at having wasted money and time.