Sora and Sunao continue their daily school lives together. Everything seems normal until Sora notices a child who looks almost exactly like him — and around the same time, several classmates begin acting strangely. Sora also starts noticing something odd about his bond with Sunao, specifically about the relationship between their alternate personalities, Yoru and Ran. Depending on the player's choices, Sora may end up with Sunao, Matsuri, Soushi, or Minato.