character: ozora_akari, character: hoshino_ruby, CD jacket package design for the 1st single "サインはB・ツインスカイ" featuring ozora_akari from Aikatsu! and hoshino_ruby from Oshi no Ko in a medium shot, centered composition with symmetrical posing. Ozora_akari, teenage girl with long wavy orange-brown hair in braids tied with red ribbons, red eyes, wearing a sparkling red idol dress with white gloves, large earrings, and ribbon details, stands left holding a microphone with both hands near her chest, smiling brightly with head tilted. Hoshino_ruby, teenage girl with long blonde hair with pink bow and sidelocks, pink eyes with star-shaped pupils, wearing a white collared shirt with pink bowtie, school jacket, poses right with one hand raised in a peace sign gesture near her face, the other resting on her hip, grinning playfully. They flank a glowing golden title text "サインはB・ツインスカイ" with star motifs and CD disc graphic below. Soft painterly anime style with visible brush textures, layered color blocks, cool teal-blue atmosphere contrasting warm golden highlights, loose sketch-like linework, ethereal glow and subtle sparkles creating an exciting idol duo mood.
