Pupa is a 4 minute show. I check it on Crunchyroll. It's such a shame. Another show that is five minutes or less is Strange +. I'll check Crunchyroll again for the simulcasts.
Tonari no Seki-kun: The Master of Killing Time is another micro series. I'm done checking Crunchyroll. I'll see if Saturday or Sunday has any new series. I'm not sure about the other shows that aren't being streamed on HULU, FUNimation, Aniplex, and Anime Network. Whoo, I need to make a simulcast guide for this season.