Other name: No other name
Genre: Comedy, Drama, Harem, Romance
Date released: Unknown
Author: Kimino Sakurako
Translator: Light Novel Bastion
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!