I've heard from a tumblr post: glutamine-nico.tumblr.com/post/93124435738/mekakucity-actors-glutamines-first-signal that he's releasing an album/single/singal(??) called Sensation Single.
I think it's worth adding to his discography, many sets were sold out in less than 5 hours. Also what is a "signal"?
Thank you so much in advance ^^