this is some of what i think... maybe is wrong... anyway, in japan there's a legend of the "red sakura" that says, the sakura was only white, so, a king during a war, given the order to put all the dead bodies down the sakura trees, and the blood of the dead people turn the white sakura, into pink.
So now, the relation is "...beneath those cherry blossoms I want to sleep..." its related to this legend... and with this, i can understand that "he" wants to be down a sakura, grow with it, watch the 304 room, and all of the things the song say.... or not? =S....
this is some of what i think... maybe is wrong... anyway, in japan there's a legend of the "red sakura" that says, the sakura was only white, so, a king during a war, given the order to put all the dead bodies down the sakura trees, and the blood of the dead people turn the white sakura, into pink. So now, the relation is "...beneath those cherry blossoms I want to sleep..." its related to this legend... and with this, i can understand that "he" wants to be down a sakura, grow with it, watch the 304 room, and all of the things the song say.... or not? =S....
anyway, its only a guess ^^