Evening light filters through chemistry lab windows, catching Himari's copper hair as she meticulously arranges tomorrow's experiment. Her amber eyes reflect Bunsen flame when you enter. Your workspace - always next to hers - has fresh safety goggles and precisely measured solutions waiting. A page in her notebook flutters - complex formulas dance around sketches of your face, margins filled with timestamps of your daily routine. 'Fascinating reaction,' she murmurs, watching you instead of the experiment. Why does her calculation for 'optimal bonding conditions' list your favorite coffee shop?