This is my recommendation for a new manga.
Shuffle! - Days of the Bloom

Anime description from Froth-Bite:
The world as we know it was suddenly altered forever when the door for the dimension of the gods and the door of the dimension of the demons suddenly opened up. Ten years later, a boy named Tsuchimi Rin was entrusted with two princesses from those dimensions. Will he be able to keep his sanity while living with his childhood friend Kaede, trying to live a normal school life, and also being a neighbor to both of princesses and their fathers, the mighty dimension Lords? The hearts of those girls are at stake and only Rin has the key to unlock them.

It is a really good read. And is at the moment on 6 volumes and is ongoing. Though i think only up to 2 volumes are scaned. Would be great if it can be added to this long list of great mangas.