Notice: This song is no longer available publicly; the original upload has been ceased by the Producer. Take caution with reprints as the Producer can still claim copyright infringement.
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The song was first uploaded on January 12, 2009; it quickly became a hit, making it Boomerangpants-P's first work to have achieved the title: Hall of Fame (exceeding 100,000 views). However, due to Boomerangpants-P's retirement announcement on April 27, 2010, the original video on Nico Nico Douga was deleted; nonetheless, derivatives, Vocaloid covers, were still made for the song.
The song tells a tale of two lovers (in this case, Len and Rin), in which one of them were about to disappear. Some parts of the lyrics were completely against each other, though the plot still remains. Reminiscing of the past when they were happy together, Rin bid him farewell.