It's a relatively old manga (2004) about a 27 year old "dried fish woman", Hotaru, whose boss suddenly moves in with her and her relationship with her younger co-worker. Meh not really good at writing summaries but the genre is Josei and Romance.
There's a hentai of the same name here on Fakku but those have no relation at all.
When I read this manga, it just feels so calming relaxing kinda like eh... can't really think of anything. But the manga is so mundane and there isn't really any drama in there, it just gives off that wonderful feeling of friendship between Hotaru and her boss.
It's quite different from all of those romance mangas I've read so far. A nice relaxing read.