High-resolution image of a boy inspired by Steins;Gate, holding a cat while talking on a smartphone. The phone is held up naturally close to his ear, with the side of the phone visible from the front, making the pose look natural and realistic. He has a shy and blushing expression, reflecting a sense of nervousness and affection. The boy's casual outfit is in soft, pastel colors like light blue, mint green, and pale yellow. His hair is slightly messy and tousled, adding to his character's intellectual and slightly rebellious look. The cat he is holding is also in soft, complementary pastel colors. The smartphone has no visible cords or wires. The background is abstract and features muted pastel hues, enhancing the overall serene and whimsical atmosphere of the image. Ultra-detailed, high-resolution, with smooth lines and gentle shading to emphasize the pastel aesthetic. --ar 3:4 --niji 6