Why Haru's older sister xx to me (Volume 1-2 is the latest issue)

Publisher: KADOKAWA/Kadokawa Bookstore
Author: Samurai Omi
Size: 128mm x 182mm
Number of books: 2
Language: Japanese
Category: Youth manga, manga
Latest release date: 2014-05-09

Synopsis:
Hideto, who is not good at girls, runs away in a hurry because of a mysterious slut, Haru sister, "Nui", but is attacked by a monster on the way. In fact, Hideto is a holder of a certain power, and is he told that he needs "Nuku" in the valley of her chest to protect himself?