They ARE soulmates , she looked at her own fortune..Have you even watched it properly? And Saiki was using mind control on her so that she cant see her future with Saiki..But we dont know if Saiki have already ... Chaeil
Yes I watched it and she clearly said that she thinks so because he is the strongest and so that's what she saw in the future that he literally saved the world
Who does saiki end up with... mikoto or teruhashi?