How all this mess got started? https://reader.vortex-scans.com/read/kanade/en/5/25/page/1
Kanade
Some back-story. It seems that both Itsuki and Isurugi have deep roots in that town. And Azumi too, for that...
Just what is Isurugi anyway? Or for that matter, Kanade? https://reader.vortex-scans.com/read/kanade/en/5/23/page/1