For people who have been waiting for an update, sorry to say that chapter 16 is the most recent chapter in the JP raws as well. In Jan 2019, the author tweeted for the first time since Jun 2018 since this comics won an award. In this tweet they talk about taking care of your mental health so it is reasonable to assume they were having a rough time irl.
https://twitter.com/str_okmt/status/1088042634143092741?s=20
In this consecutive tweet also tweeted on the same day, the author says they have plans to resume the comics and will inform everyone closer to the date.
https://twitter.com/str_okmt/status/1088043851229478912?s=20
As of now a year has passed and the comic has been given a drama CD but there have been no updates from the author themselves as to when the next chapter will come out since it was published in a magazine and on pixiv comic on a chapter by chapter basis (as to being full volumes only).
Note that this is DOES NOT MEAN THE SERIES WAS DROPPED/AXED BY THE AUTHOR, as when that happens the author has the responsibility to let their fans know. In all my years of reading and following authors there has never been a time where they failed to tell the fans if their story was going to be discontinued. The only thing we know is that after the creation of chapter 16, the author may have had some problems with their mental health and since then has been doing their best to return. Even if the author ends up being unable to finish this story ever, I hope they are doing well in real life
2021-04-17 07:28 marked
Series on Hiatus