Wadanohara and the Great Blue Sea is a pseudo- RPG with a heavy story focus, made by Deep-Sea Prisoner in RPG Maker 2000.
You can download the game here: http://vgperson.com/games/wadanohara.htm
I do not own this game nor do I own the music. I merely am uploading it for other's enjoyment. The sources for the music used in the game can be found in the link above. This song's source is Music Egg.
Though this game looks really adorable, it is actually rated ages 18 and up. Viewer discretion is HIGHLY advised. There is a more detailed list of content warnings on the link above.