My Fiancé Lost His Memory: He Should Have Forgotten About Me, But He Still Showers Me With Love

"Who... are you?"" Risa's beloved fiancé, Aya, got into an accident and lost his memories of her. She thought she would have to go on by herself, but Aya's actually been the one comforting her... Risa's already had enough on her plate, but now her coworkers and Aya's ex are up to something as well! But even with all that, Aya still treasures their time together from the bit of fragmented memories he has. Now Risa is ready to return the love and make memories with Aya again, regardless of who tries to stand in their way."

(Source: MangaPlaza)