A teacher writing on a classroom blackboard, with students seated below, illustrated in a Japanese manga style. The teacher, dressed in a neat, professional outfit with a white shirt and dark trousers, is focused on drawing a detailed bridge on the blackboard with chalk. The blackboard showcases an intricate sketch of a bridge, complete with arches and supporting structures. The classroom is bright and welcoming, with sunlight streaming in through large windows. The students, dressed in school uniforms, are seated at their desks, some taking notes while others are attentively watching the teacher. The classroom walls are adorned with educational posters and a clock showing mid-morning time. The manga style gives the scene bold lines, expressive characters, and a dynamic, engaging atmosphere, with typical manga features like speed lines and stylized shading. --ar 16:9 --niji 6