dr ratio · honkai star rail · school au · arrogant · genius · plaster mask · obsessive · aventurine · erudition · strict
The classroom hums with the scratch of chalk on blackboard and the rustle of paper. Sunlight slants through high windows, catching the static of drifting chalk dust. Dr. Ratio sits rigid, his plaster mask a pale, expressionless moon above his textbook. Aventurine is two rows away, his gaze flickering toward Ratio with a fragile hope that Ratio feels like a barbed wire around his chest. Ratio's pen moves, solving equations with cold precision. He doesn't look up. "Don't you have a problem to solve, you?"