Desu Desu

A blue-haired girl in a school uniform stands on a city street, facing a male student, her fists clenched in a determined stance as she appears to confront him. The scene cuts to a classroom where the same girl stands beside a boy raising his hand, then to a group of students where she looks at a phone, before returning to the street confrontation, followed by a shot of her peeking nervously around a corner and then smiling contentedly.