This trip is def directly related to the previous series of Mochi sensei, Yuri Inn, as Kagaya-san is the same family name of the owner of that Inn in that series.
And if you haven't know, the Inn is run by an all-yuri family. :D
I just hope Kouhai-chan doesn't get weird idea about trying to broke the fate red string by liking someone else just to prove the string doesn't work...
I am such a fan of this series that I drew a fanart of Yui and Kanata even before the official LN cover was even release 🤤
https://www.pixiv.net/en/artworks/124885247
as far as I know , there is no translation for the LN. I read the web novel ver. and this story is one of the most popular yuri WN on Kakuyomu. I use google translation to read it. :D