These 3 girls have "felt the paranormal" much more directly (canceled suicide, canceled pregnancy, and whatever Tsuneyo is doing), and have remembered things that only happened in the past worlds: Makoto remembering coming to the beach resort and faintly recalling her suicide, Ayane remembering her pregnancy, and Tsuneyo remembering the amusement park date. If this is miraculously onto something, what's left to be solved is the timing of joining RAS (more specifically, why Makoto arrived at the 6th and not earlier) and why these 3 could achieve this and not others.