Relativity theory

Time is passing so quickly... Right now, I feel like complaining to Einstein.
You know, Okabe...
Whether time is slow or fast depends on perception.
Relativity theory is so romantic... and so sad.

-Makise Kurisu-

You know why big brothers are born first? To protect the little ones that come after them.

-Ichigo Kurosaki-

So how about big sisters? Can they do the same?