A man re-encounters a childhood friend -- and victim -- of his who isn't ready to forgive or forget his past transgressions. One of those stories that fits strictly within bl manga rape logic, where rape is just a declaration of unrequited love, this story always seems to be teetering on the edge of a much more dramatic tragedy (c.f. Fusa Juuji's The Gospel http://www.mangago.me/read-manga/the_gospel/, which similarly chickens out of the dramatic "bullets-fly-everyone-dies" ending it seemed to be headied for), but settles instead for an unrealistic, but satisfying conclusion where the two mains forgive each other and themselves. The climax, which involves an attempted double suicide, a hospital visit, and a very emotional confrontation on a stairwell, is well-manufactured if you ignore rape-as-romantic-window-dressing. I can't help considering this to be "Kunieda Saika's B-team," even though I think Fukai Youki is competent enough in her own right.
Sono Kuchibiru ni Yoru no Tsuyu