i think its because it was originally meant to be like 'one day...'(so and so happened) 'one day...' (so and so happened) story of two best friends so maybe 19 such days/incidents and it just kinda......never stopped. it started off as somewhat like slice of life anime genre and now its a full-on story
There is a reason and it has nothing to do with the story at all. But I don't really remeber, all I know is that it wzs a reference to one of the work Old xian (the author) used to do with another author from the studio mosspaca. But yeah, sorry I don't remeber anything else, only that it had nothing to do with our boys

Ok I'm gonna ask it's been like 500 chapters why is this called 19 days is there an explanation