Hakui kaikan: Oppiroge gohôshi(2009)

Nana, a graduate of a nursing school in the countryside, began working at a private hospital in Tokyo. The hospital director, Kazuto, is a handsome man with a wealthy family, but he's a mama's boy and has a penchant for younger girls, making him still single. The two are drawn to each other and begin dating. However, when the senior head nurse, Ayano, finds out, she begins a relentless harassment campaign…