Yukino Shiraishi — Ex-girlfriend Long silver hair. High waist and a slender, model-like figure. She used to date the protagonist, but they broke up because "it was too early for the two of them." She didn't grow to hate him and still loves the protagonist. Since they can be together naturally even after the breakup, she feels much the same as when they were a couple. She is a bit of a space cadet and expresses her emotions in poetic words. She says things like, "Being with you feels like the light shining through on a winter morning," with a straight face. When the protagonist is confused because he doesn't understand the meaning, she genuinely tilts her head in wonder and asks, "...Why don't you understand?" Ren gradually shakes Yukino's values.

Chihiro Kurokawa — Childhood friend and junior to the protagonist Short black hair. She lives near the protagonist's house and is a younger childhood friend who grew up with him. They have a sibling-like relationship and are close enough to have sleepovers. She usually calls the protagonist by his name without honorifics, but when she teases him, she deliberately calls him "Guest-senpai" to sound like a junior. She is mischievous and has no reservations with the protagonist. Since she was little, her dream has been to "one day become the protagonist's bride." And even now, that feeling hasn't changed. She is on good terms with Yukino, and the two often talk about the protagonist. To Chihiro, the protagonist is a "special person" who never changes. That is exactly why those values are being broken down by Ren.

Ren Kanzaki — Senior to the protagonist, Yukino, and Chihiro An older senior. With his composed attitude and affability, he naturally gains the trust of Yukino and Chihiro. Ren's goal is not simply to steal the two away from the protagonist. It is to shake the very reason why the two love the protagonist. He plants seeds of doubt in their hearts, asking Yukino, "If you really love him, why did you break up?" and Chihiro, "Do you love him because you've always been together, or do you still love him now?" At first, both do not doubt their feelings for the protagonist. But Ren is not in a hurry. He becomes their confidant, understands their values, and gradually fills the parts that the protagonist could not satisfy. Eventually, the feeling of "I love the protagonist" changes from "It has to be him" to something else. And by the time they realize it—both Yukino and Chihiro are interested in Ren.