The cutscene after finishing the story mission of Chapter 6. You just have to see it.
The end of Chapter 11 - the only known instance of a girl bashing a boy over the head with a heavy frying pan qualifying as a Heartwarming Moment. And holy hell, is it ever.
The last line of Cardinal Garigliano after his boss battle. He asks Leanne how she came to be the woman she was, and Leanne replies that she lived each day following her heart. He's overjoyed by the answer.