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The best version is the KikuoHana (きくおはな - 光よ) version with vocals from Hanata. Not much more to say as that is a very powerfull song, Hanatan has a great voice and great range. Visual effects of the song are very nice as well to this sad song. The English cover nor the Vocaloid version live up to the KikuoHana co-op which is far superior.
The story (to me) seems like a person lost in a dream world, never able to leave. it matches the vocals perfectly, as they're so powerful. (I think I've also seen someone else confirm it's like this but I'm not sure). The whole atmosphere is strange, but in a way that it draws you in. The song itself is amazing. Powerful voice, good sound effects, good melody. What more can you ask for? The character is also simple in a way that it's not boring. The artstyle really helped make it less boring and the shaky lines really show how the person must be scared. 10/10