Baby Princess (6)

is the sixth volume of the Baby Princess light novel series, written by Sakurako Kimino and Illustrated by Natsuki Mibu. It was released under the Dengeki Bunko Imprint in January 2011.

Synopsis
"Your brother and Hikaru aren't a family-what do you mean?" A night in Oiso where fireflies heard a secret conversation between the main character, Yotaro and Hikaru. After returning to Tokyo, Hikaru vacated his house at a kendo training camp, and Fireflies behaved brightly as if nothing had happened. Take care of her sisters' homework, help with shopping, go to summer festivals ... Surrounded by a large number of sisters, Yotaro spends his first lively summer vacation. At first glance, the angel family has a warm time as usual. However, the relationship that started moving can no longer be turned back. Following the rapid development in the first volume, the latest work that spelled out the conflict and growth of Yotaro and 19 sisters.

(source: Amazon JP - Translated)