つきツキ! / 守护灵露娜 / 츠키츠키 / Tsuki Tsuki!
Rank: 19851st, it has 72 monthly / 1384 total views.
Genres: Manga / Seinen / Action / Comedy / Drama / Ecchi / Harem / Romance / School life / Supernatural
Status: Ongoing
Summary:
One day Shinobu wakes up just to find a naked blonde girl sleeping besides him. He has no memory whatsoever of her. Who is she? Why is she in his bed? Why is she naked? To make matters worse, his sister comes in and sees them. What will happen now?

adaptation of the light novel series written by Gotou Yuujin with illustrations by Riko Korie

http://www.mangaupdates.com/publishers.html?pubname=Comic+Alive

Published in a Seinen Magazine. Please do not change demographic to Shounen!