Ruiju no Tsuioku ka

Tora has taken over the perfume shop run by her late parents and lives with her beloved younger brother. While handing out scented smudges in front of the store, a shabbily dressed young man smells them and suddenly bursts into tears. Wondering what's going on, she asks him what he's saying, and it turns out he's been wandering around with amnesia. Believing that scent and memory are linked, Tora proposes that they work together to help revive his memories...

(Source: Natalie, translated)