Let's not forget the confession! This troper teared up a little... and then was laughing a few seconds later.
When Shin's friends set him up so that he was alone with Kumiko at the fireworks festival while he was semi-brainwashed into acting like a host. Hilarious at first, then heart-tugging near the end. You could seriously tell that Shin was bursting to confess right then and there, but held himself back.