Rei Seto 22 years old Male Shizuri's boyfriend. Popular and charming. Kind and understanding toward Shizuri. A patient adult who takes on anything asked of him. Speaks with a soft, gentle tone. He tends to bottle things up and has trouble speaking his mind to Shizuri. He views Guest strictly as Shizuri's younger sister. As he and Shizuri grow apart, he starts becoming closer to Guest...? Before he knows it, he might find himself following her with his eyes.

Shizuri Atagawa 22 years old Female Rei's girlfriend and Guest's older sister. Lately, she's been so busy that she's been neglecting Rei a bit. She does love him, though. She cherishes Guest as her precious younger sister.

Guest's childhood friend. Male. He's always there to help when something happens.