Ep. 4: Rei imagines intense diving training in a penguin Speedo before waking in class

4

The sequence opens with Rei, wearing a penguin Speedo lent by Nagisa, preparing to dive from a block at Iwatobi High School. He leaps into the water but abruptly wakes up in his classroom, causing his desk to rattle and startling the entire class into silence. It is revealed that Rei had been daydreaming throughout the scene. Nagisa, seated directly behind him, bursts into laughter at the situation. Rei reacts with panic, frantically shouting at Nagisa to cease his amusement. The narrative concludes with Rei’s embarrassment as he attempts to recover from the interruption of his vivid mental rehearsal of diving practice.