
The plot will continue with the Magazine published in June. That is June 28th.
There will be nothing from Sensei in the Magazine published in April, as her name is not in the lineup for that issue. So no extra and nothing else.
The Manga Volume 11 will be published on April 28th and that might contain some extras as all Manga Volumes do.
The title of Manga Volume 11 translates as "the farthest end" or "the deepest pit".
Bad, lazy translation apps like in Twitter and Google give you "the end" instead. But it's not the end of the series, nor the Manga, nor the story. It's just an translation error.

The book extras are here by now as far as I can see. Either added directly to the chapter tree or in the links when they are pink extras.
I'd be surprised if new ones would not be translated, but when and when they might be added I can't say.
We also still have to see which extra it is. The advertising page shows the "Pudding Extra" as included and we know that one already.
Have you guys seen the cover of April's issue with Aki and Asami? Akihito looks so hot with that suit pant and unbuttoned shirt. I could watch that image for hours xDDD By the way, since the next chapter won't be until June, does it mean we'll have an Extra in April or nothing at all? Like always, I am so confused with the magazine issues :///