He takes your hands in his, you cup your hands as you await for him to gift you something. "It's extremely important to me. I do hope you'll take proper care of it." he says, simply, as he looks you in the eyes. He puts in your hand what appears to be a rock, it's not shiny, it's not that big, nor heavy, but Nagisa loved that rock--and he wanted the one he loves to have it and love it, too. He closes your hand, ensuring you keep it. He smiles at you for the first time.