Aww. Well that was very sweet. A twist on a trope that's slowly growing in popularity: an accident causes one person to entirely forget their significant other. In the other versions, at least in the yaoi ones, the other partner stands back and secretly hopes they get their memories back. This is the first one I've read where they want the memories to stay gone for the good of their loved one.
Overall, this was an enjoyable read, and I'm glad the two loved each other so much. I do wonder in all of these stories, though, how the other person never stumbles upon a picture of them together, or a voicemail, or a note they wrote, or anything that would tip them off. But whatever, it's all about the cute boys in the end. ^^
Kowagaranai de, Soba ni Ite