Secret Letter from Sound Horizon ATXX Website TN: Upon the digital release of 'Halloween to Asa no Monogatari,' the exceptional website for Sound Horizon Around The Twentieth Anniversary (SHATXX) updated. Upon clicking the 20th in the site's logo...

I've translated the secret letter from the exceptional site:
kaidotl.livejournal.com/65264.html
#soundhorizon #linkedhorizon #halloweentoasanomonogatari