Title: Baby Princess

Author: Kimino Sakurako

Illustrators: Natsuki Mibu & Yuki Kiriga

Genres: Comedy, Drama, Harem, Romance

Translation: Soul Translations

Youtarou is a high school freshman, who, for a long time, believed himself to be an only child. However, after his only relative dies, he is taken into a family, and suddenly discovers that he is now the brother of 19 sisters, ranging from the eldest who is 18 years old, all the way to the youngest, who is 0 years old!

How many non-blood-related sisters are too many in the LN world? Apparently not 19.