I didnt see anything of the sort? The only thing I saw her say was thanks for reading up to this afterword. If I got it wrong, please let me know. Also keep in mind that is a Chinese book that was translated from japanese so if you're trying to read it in japanese you'll have a hard time.
Also I highly doubt their story will be over until yuki says I love you.
I have read this. But still feel incomplete
http://www.mangago.zone/read-manga/masato_sama_no_urei_aru_nichijou_to_kare_wo_aisuru_monotachi/
In raw language, the author explain that this is the last volume final time of the hall so is this the last one? https://www.177mh.net/201705/358056.html#@page=189