what I think on the plot of the STEP you is...
'1,2, STEP you' = is like yea she wants to step on something..meaning she wants to forget all her doubts or anything she wants to put away....It's like stepping off on all your fears and hindrances in life.... get it? ^^
'The gap between idealism and reality'=the line which seperates "something"
Is so very cutting'=can't be inevitable? (did i use the right word?) it's like they can't avoid the fact that they';re seperated.
'And as we cannot cut them off, they are opening up.'=we cannot do anything for it, but slowly we it is fading...it's like they're slowly trying to understand everything...
'oh yeah yeah yeah'=and yeah oh yeah yeah yeah! ^____^
and DUTY....
'If, after simplifying it a bit more, you think that "it"=after trying to understand eveyrthing once in awhile
'merely connects and arranges memories,'=the thing/problems/fears/wants/possessions slowly tries to recover our memories...
'then wouldn't everyone already have "it?"'= she's saying about the thing/problems/fears/wants/possessions
'I want you to realize that. '=yeah! she want you to realized that!