MangaDex is very flexible: it effectively allows any group of images of art-with-text with the same characters to be called a "manga", even if those pages would normally just be considered sketches for Pixiv or Twitter, and even if there's little continuity or order between them. When we think of a manga on MangaDex, we should really think of it as a "collection" in the most abstract sense.
And I've discovered so many great Twitter-based works thanks to MD not being as strict as sites like MAL when it comes to what counts as a manga.
Just read through most of the chapters just then, and was thinking exactly this.
Almost none of these say anything besides the plot of the story - she's loved him for 10 years, there's a 10 year age gap - we get it already!