New tweet from Fusanosuke-sensei (for J-Garden event on 8th of October):
"This is how I'm working on the sourvenir booklet during my break (*╹◡╹)و✧ Don't throw out the paper obi from the manga or your receipt, bring them with you! I might be able to do something for the people buying the ebook too, I'm thinking about how to deliver it."
(Sadly I can't go 'cos I'm already going to a concert in Osaka that day. Hopefully can get my hands on the booklet sometime!)