n summer vacation, the parent of the person of Nanase went out to overseas travel.
Would spend summer vacation only with five Younger Sister with the older brother who was a chief character……
The Younger Sister which was released from the eyes of the parent from a school are strangely aggressive, and have an in sequence naughty event.
The older brother who I cannot tolerate such situation, and is excited.
Where will brothers of the person of Nanase integrally go to?……! ?