Shower thought ahead (no, I did not think of this in the shower)

"Misaki" sounds like "Murasaki," which means purple in Japanese.

Kaoru's image colour is purple.

Misaki and Kaoru have 4*s together in not one, but TWO events (more than Chisato and Kaoru), which means they have the most important roles in the story,

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Stop thinking about Chisato. Misaki and Kaoru are related