Sangatsu kokonoka, translated, it simply is "the 9th of March". I am left wondering the significance of the date. This song was used in the drama serial, 1 litre of tears, and sounds like a love song. That's the beauty of imagination, it accomodates the mssing pieces to produce a complete picture that is quite beautiful.
When you are able to barely comprehend a few words in the song, you let your mind tell you the meaning through the music and the feel of it, and this song feels good.
Everything in this world can be interpretted in different ways, and how beautiful the interpretation is solely dependent upon your mind. Open minds often find it easier to see the beauty in the ugliest of messes, and a closed mind that can only see the worst in a pretty picture.