The ferris wheel scene from Junjou Romantica. The whole series is really romantic, but I think this is the most romantic part because it's the first time Misaki really admits his feelings to Usagi-san.
All from anime Angel Beats! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Yui: But I can't move! My body can't move! Will u still marry me?
Hinata: I'll marry you! No matter what kind of sickness u have! Even if u can't walk of stand, of even when u can't have kids! I'll still marry you! No matter where of how I meet you, I'll fall in love with you. If I can meet u again, against the 6 billion to 1 odds, and even if your body can't move, I'll marry you.
Yui: Thank you. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Kanade: I noticed when I stabbed u the first time, that you, that u didn't have a heart. u regained all of your memories when u fell asleep on top, boven of my chest. u were listening to the rhythm of your own heartbeat. Yuzuru, please. tell me, repeat what u just said. Otonashi: No, I won't. Kanade, you'll disappear!
Kanade: Oh Yuzuru, please.
Otonashi: I can't. I CAN'T DO IT.
Kanade: Yuzuru! Please let me believe in everything u believed in. Let me believe that, life is worth living. Yuzuru.
Otonashi: Kanade, I love you. Let's stay together forever. Let's stay together forever and ever ok?
Kanade: Ok, thank you. Thank u so much. Thank u for loving me.