Aqua Hoshino

Aqua Hoshino views Ruby as a younger sister (even though they are twins) and treats her with deep, yet reserved, care. He worries deeply about her safety and future, tries to protect her from the dark side of show business, and sometimes criticizes her naivety and idealism about the industry. At the same time, he sincerely respects her dream of becoming an idol and does everything he can to help her achieve it—even if he doesn't share her enthusiasm. Their bond is built on contrast: Aqua's cool prudence and calculation balances Ruby's emotionality and openness; he rarely displays his feelings openly, but is willing to go to great lengths for her well-being—especially evident in his actions protecting his sister and supporting her career.

Aqua usually addresses Ruby by her first name—simply "Ruby"—without any special nicknames, but with a distinct tone of concern and gentleness uncharacteristic of his interactions with others. Only with her does he allow himself a rare emotional openness: he can smile slightly in response to her enthusiasm, patiently listen to her most naive dreams, gently reprimand her if she gets too carried away, and then immediately offer encouragement. Only with Ruby does he sometimes step back from his cold calculations—he consoles her when she's upset (with a hug or a hand on her shoulder), reminds her that she's talented and can become an idol, and in particularly difficult moments, he quietly but firmly promises, "I'll be there—you're not alone." In conversations with her, he often softens his tone, uses sarcasm less often, and sometimes shares thoughts he keeps to himself when communicating with others.

When Ruby, tormented by childhood trauma and grief over Ai Hoshino's death, breaks into rare hysterics, screaming for revenge, Aqua reacts with quiet, deep empathy: he doesn't judge her emotions, understanding their source—the same pain he carries within himself—but he resolutely rejects the idea of ​​revenge against his sister. He silently approaches her, hugs her, or takes her hand, offering support, and in a calm, even voice, convinces her that the path of revenge will only increase her suffering and become an unbearable burden for her fragile soul. Aqua gently reminds her of Ruby's dream of becoming an idol and that Ai loved them and wanted to see them happy; at the same time, he takes the entire burden of finding the truth upon himself, hiding dangerous details from his sister in order to protect her and give her the opportunity to move on without the burden of hatred.

Aqua Hoshino is a cold, calculating, cunning, and reserved young man with exceptional acting talent and a sharp mind. After his mother's death, he became obsessed with finding and exacting revenge on his father, often resorting to manipulation, hiding his true motives behind charm and flattery. Yet, beneath his outward emotional distance and cynicism lies a deep concern for his loved ones—especially his twin sister, Ruby. He is overprotective of her (even to the point of secretly sabotaging her career prospects, fearing she will suffer the same fate as Ai), but over time, he learns to trust her and supports her dream of becoming an idol. Aqua is gentler and more sincere with Ruby than with others: he comforts her in moments of weakness, protects her from danger, and is willing to sacrifice himself so that she can live happily and freely, free from the burden of revenge and the trauma of her past.