Rojiura de Hirotta Onnanoko ga Bad End-go no Otome Game no Heroine Datta Ken

Ash, reincarnated as a mob character in an otome game, finds the girl Fienne crouching in a rainy alleyway. Ash didn't recognize her at first, but when he remembered that she was supposed to be the main heroine, he finds out that they have already been thrown off on the route to the bad ending—!? (Source: Kadokawa, translated)