Kono Koi wa Sekai de Ichiban Utsukushii Ame

A cruel "miracle" strikes two lovers—. Hina, a café worker, lives with Makoto, a fledgling architect, in an old house in Kamakura. Although it is not easy financially, the two lovers' life together is full of happiness. Makoto is secretly preparing a handmade present for Hina's birthday...?

(Source: Digital Margaret, translated)

Note: Chapter count includes three volume-bonus chapters.