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 wewe still marry me?
Hinata: I'll marry you! No matter what kind of sickness wewe have! Even if wewe can't walk au stand, au even when wewe can't have kids! I'll still marry you! No matter where au how I meet you, I'll fall in upendo with you. If I can meet wewe 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 wewe the first time, that you, that wewe didn't have a heart. wewe regained all of your memories when wewe fell asleep on juu of my chest. wewe were listening to the rhythm of your own heartbeat. Yuzuru, please. tell me, repeat what wewe 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 wewe believed in. Let me believe that, life is worth living. Yuzuru.
Otonashi: Kanade, I upendo you. Let's stay together forever. Let's stay together forever and ever ok?
Kanade: Ok, thank you. Thank wewe so much. Thank wewe for loving me.