This is a special episode of the Somera-chan series which I couldn't find on any regular streaming sites but it's there on youtube. It's not subbed though so you'll have to watch it raw. It's almost 10 minutes long unlike the regular Somera-chan episodes which are only 4 minute long. But the episode length is just a scam. The actual episode is in the first 3 minutes only. It's about Matsushima being Matsushima and doing batshit crazy shit mostly. Then there's a 4 and a half minutes long ending song which is followed by a drawing song (that we all love). At the end thereis a short Mennouse trivia segment which tells us that they explode when they eat apples.

There's very few people who watch or even know about the Somera-chan anime and this special probably won't ever get subbed, so even fewer people will watch this I guess. If you've watched the main series then you probably know that the final episode ends on a cliffhanger, so I'd say just watch this too for closure even if you don't understand japanese.