A live fish

Two male anime characters in school uniforms stand close together in a classroom, one holding a piece of paper, before the scene cuts to a close-up of them embracing and kissing. The sequence continues with a shot of two hands reaching toward each other over a drawn line, followed by a blurry image of two figures walking away from a doorway, and concludes with the same two characters embracing and kissing on a park bench at night under a starry sky.