Gokujou Danshi to Kurashitemasu.

Synopsis

First Kurumatani Haruko Long series (no more a simple oneshot)!!! By Alessia-chan: Ruki is an otaku and is in love with a character of manga called Shun-sama! Suddenly she meet a guy that will live in her house due to her mother sudden travelling and that looks exactly the same of Shun-sama! But does this guy is really a prince-like such as Ruki expect? *from MangaUpdates*