Lamune tells the story of a boy named Kenji and his childhood friend Nanami. Although, everyone seems to know that they have a relationship, neither are determined to push it anymore than close friends. The story goes through flashbacks, explaining why they are such close friends and any action doesn't seem to push them apart, but draw them closer.
This anime has a good story and the romance is also good :D
Maybe the animation isn't good enough but try to watch this anime (in particular for Anime romance lovers), you won't be harmed ;)