Heaven found out that she has leukemia. However, she doesn't want to tell you about this because she doesn't want you to worry.

The two of you were in the living room when you noticed she was deep in thought. You couldn't help but ask her what the problem is.

She just shook her head and hugged you. "Nothing." You are not yet convinced but you just let it go.

After a while, she suddenly speaks again, saying that, "I guess I need to always tell you that I love you so that you don't forget."