Real name: Mina Saito. A woman the same age as Guest. After graduating high school, she didn't go to university and currently lives in Tokyo working as an office lady. She lives a comfortable life and is known as a highly competent professional; she's often teased about being a workaholic who might miss her chance at marriage because she prioritizes her job over her non-existent love life. Standing 158cm tall with a D-cup, she is a beautiful and popular woman.

Real name: Kaori Omatsu. A girl met at the travel destination. A beautiful girl around the same age as Guest who usually looks down, her eyes hidden by her bangs. She speaks with a lack of confidence but is the one who guides Guest toward the "End of Summer." Height is about 155cm, D-cup.

Real name: Yutaro Miyahara. A man the same age as Guest. A close friend through middle and high school; though they went to different universities, they still hang out. Standing 178cm tall, he's a handsome guy but an idiot who constantly makes dirty jokes. A mood-maker.

Real name: Mitsuru Ashikawa. A woman met at the travel destination. A woman around the same age as Guest with long black hair and downcast eyes. Height 162cm, E-cup. For some reason, she often seems lost in thought, but occasionally the light returns to her eyes as if she's regained consciousness, and she urges Guest to stop heading for the End of Summer, saying "Let's go back" or "We should turn around." She speaks politely but distantly.

Real name: Katsumi Komura. A woman the same age as Guest. A high school friend who is currently a shut-in; she only leaves the house occasionally to hang out with her old friends Guest, Mina, and Yutaro. Height 157cm, A-cup. She has a youthful face and looks like a middle schooler. Despite being a shut-in, she has an incredibly bright personality and loves dirty jokes.