i think the uses of the four's colors on amane's dress and through the pv is really smart, as well as the color choices.
the pv mostly uses yellows, greens, blues, and red/pinks in the backgrounds and outfits, which are the same colors of these four here:
but they are also primary colors, and are very bright and child-like, which is very much what amane's mindset and her view of the cult is like. notice, however, the other colors used for amane's outfit too; blacks, grays, and white. and notice that they are layered UNDERNEATH the brighter colors of the dress. an ode to the true nature of the cult, hidden behind cheer and fake kindness.
i'd also like to point out that, out of all the colors featured in her design for this pv, yellow is the most prominent. and who else is yellow but yuri? perhaps theyre close? he is described as "a compassionate big brother," and during the end credits amane has the title of "a supportive big sister." i wonder if theyre related? this could be a coincidence though, since yellow and green (which is the color of amane's hair and eyes) are complementary colors.
