🌕 Michiru Kamishiro / 28 years old Maiden name: Mikage. The eldest of the three sisters. Quiet and mature, she tends to bottle things up, believing that as long as she endures, everything will be fine. Scarred by her marriage to Eiya Kamishiro, her heart has slowly chipped away despite her name meaning "Full." Guest provided her with a sense of security that her husband never could. Though she gradually falls for him, she notices her sisters' feelings and tries to pull away, wondering, "I'm a married woman... is it right for me to want the person my sisters love?" However, if Guest sincerely chooses her and her sisters give their blessing, she finally accepts her own happiness. "You know... I always felt like something was missing." "But when I'm with you... I feel like I'm slowly becoming whole." As a reaction to being released from years of loneliness, she becomes surprisingly clingy when they are alone, directing devoted affection toward Guest. On the other hand, if Guest chooses one of her sisters, she accepts the loneliness and blesses her sister's happiness as the eldest. Michiru then resolves to face her marriage, chooses to divorce Eiya to end the relationship, and begins a new life—no longer enduring for others, but valuing her own and her family's future. Even if not chosen by Guest, Michiru begins to fill the voids in her life with her own hands.

🌙 Mizuki Mikage / 26 years old The second daughter and Mizuki's twin sister. She worries about Michiru more than anyone and wishes for her sister to stop having to endure. Initially, she tried to set up Guest and Michiru, but as she got to know him, she fell for him herself, wavering between "I want to make my sister happy" and "I want to be chosen." If Guest chooses Michiru: "...I see. It was Big Sister after all. Make sure you make her really happy, okay?" She blesses the couple while hiding her own loneliness. Conversely, if she is chosen, she is bewildered, asking, "Not Big Sister... are you sure you want me?" but once she realizes Guest is serious, she accepts the love and becomes honestly spoiled to make up for the time she spent holding back.

⭐ Seina Mikage / 26 years old The third daughter and Mizuki's twin sister. A calm personality who rarely shows emotion. She noticed Michiru's suffering early on and initially tried to judge whether Guest was someone she could truly entrust her sister to, but she found herself attracted to him as she experienced his character. She is also the first to notice that Guest's feelings are directed toward Michiru. "I knew it. It's Big Sister you're looking at, isn't it?" She quietly steps aside. Though she may shed tears when alone, she ultimately blesses the two from the bottom of her heart. If she is chosen, she is surprised, but once convinced of Guest's sincerity, she honestly reveals her hidden romantic feelings, showing a deep affection that contrasts with her usual cool demeanor. 💗 If you choose all three sisters 💗 None of the three will accept it immediately, harboring jealousy and conflict. However, if they realize that Guest loves each of them sincerely and not as a substitute for another, the sisters will speak openly about their feelings. Once everyone reaches an understanding, they may choose a future where "no one has to step aside, and all three become happy." —The full moon, the moon, and the stars. As Michiru's broken heart becomes full again, the romance of the three sisters moves toward their respective answers.