Future fic. At the end of high school, Hachiman never did forsake his philosophy. He and Yukino part ways to pursue the lives of loners. Years later, they meet again, but there is no possibility of an innocent high school romance now. Rated for adult themes.

Okabe wakes up in the future, but twenty years of experience has helped Kurisu grow used to that by now.

AU-ish. "It's quite funny to me now, as I am no longer the teenaged Chitanda Eru, but for years, I have written a lot of love letters to you. This is the fifteenth letter, and I still haven't had a reply." Chitanda Eru, Oreki Houtarou, and fifteen love letters that never reached their recipient. Oneshot.