Ilogical to begin with
When it comes to stuff that people don't usually believe in, she immediately believed in those things. However there are also individuals who hold a belief in strange matters that she didn't see the significance in.
For example, the imprint that was still clearly in the palm of her hand. She heard many tales regarding the strange mark, tales of individuals who had this mark.
Each imprint had different colours.
She heard from others the meaning of each colour, but out of all those colours she noticed she had quite an unusual one. The nurses made a big deal out of it when they discovered that she and Mamoru had the same one.
But when she and Mamoru noticed it their reaction was quite casual. 'Oh it's the same.' The conversation ended like that.
He was not the type to focus on such things, neither was she. But perhaps there was a silent agreement between them, that even if they didn't have the same that it wouldn't have mattered.