LDK

LDK is a shojo manga by Ayu Watanabe. It ran in the Bessatsu Friend manga magazine from February 13, 2009 to August 12, 2017. It is complete in 24 volumes. Kodansha Comics has licensed the manga for release in English.

It was adapted into a live-action film in 2014.

Plot
Aoi Nishimori is a high school girl who lives alone in her own apartment, but to her surprise, she discovers that the prince of her school, Shusei Kugayama, has moved in next door! To add to this, a series of crazy happenings result in the two living together under a single roof! Shusei is known to be a heartless guy, and Aoi particularly hates him after he coldly rejected her best friend, so a life of cohabitation seems like a recipe for disaster. And yet, Aoi somehow can’t stop her heart from pounding when she’s with Shusei...

Official
Official English site