These are the letters sent from Usagi to all her senshi and Mamoru. After finding out she has a terminal illness and will not have much longer to live she cannot bear to tell them herself and one by one before the day of her death she sends them each a letter telling them herself. On the envelope given she explains why she is sending the letters and how she feels...
It's creeping upon me, I don't know what to do. Shall I be reborn? Shall I just cease to exist. I used to believe in Heavan, when I was small I loved the idea of having wings and sitting on a fluffly cloud playing a gold, little harp. Now, that seems silly but I loved the thought if life never stopping and being able to watch and be there with my family even when I'm not around.
I must wait now, mom, dad and Shingo know. They were the first but I made them promise to not tell anyone, I hate the thought of my friends looking at me with sadness and fretting over me. I want to slip away peacefully without anyone knowing. I don't even want Mamoru to be there.
Please, when you read this letter don't think of me as dying, think of me as living still and always will be.