Awesome song to an awesome anime. I will someday learn to speak Russian.
To give you an Idea on what she's singing. Its basically a song about how she loves this guy/girl and pretty much how this person become so much a part of her life and she can't live without them. She loves this person so much and is pretty much singing a "Thank You" song about how much they mean to her.
If I ever get a mate, I would sing this for them. I would sing this from the deepest part of my being, loud and proud, with all my heart and soul.