Furyu going to release soon in Japan the new Caligula strap set and mugs with the design of the main characters and the key visual.
You can pre-order them from the Ami Ami, Chara-Ani and from the HOBBY SEARCH. According to Furyu each of them will be available from 2017 March.
You can find the sample pictures on the official blog page of Furyu: http://www.cs.furyu.jp/caligula/blog/