The first episode of the fourth iteration of anime shorts series Fastening Days was streamed on the YKKGlobal YouTube Channel on December 4 in both Japanese and English dub.
The Fastening Days anime CM series has had three other iterations since the first was released in 2014.
Fastening Days 4 will have three episodes, with the first already released, episode 2 will be released on the YouTube channel on December 12, with episode three released on December 19.