Senpai

A man wearing a blue cap appears in a dark, mountainous landscape, then transitions to a dimly lit room where he looks at the camera, followed by a split-screen showing him lying on a red couch with the text "senpai," then standing with arms outstretched in a bright, empty hallway, then seen from behind in a mirrored effect, and finally in a group shot with others in a dimly lit room.