2558 Days is Matsui Rena’s solo song, coupled with SKE48’s upcoming single, Mae No Meri. The “lyric version” and “special edit version” of 2588 Days was recently released.
According to the video’s description, this version was created to emphasize the message found in the song’s lyrics.
It also appears that the “special edit ver.” is now available for viewing:
I’m writing about useless and stupid things a lot, and I like to laugh. My policy is 一期一会。It means treasure your meeting with everyone!