I think there has to be all sorts of contracts to rent a department.
Contracts cannot overwrite law.
Either way I don't think it's at all clear that she's got to find something new immediately; it might very well have been a notice for a few months ahead. She's just had it on her mind (obv, having just been informed that it's going to happen) and casually looked at some options.
Might I point out the story still hasn't even scratched the surface of whatever 5D chess game Sister Gigantea is playing, nevermind now the actual context of why the Sussy Plushy Mascots are engaging in all this bullshit song and dance in the first place? Finishing here would have left any number of plot threads hanging loose and just generally had the smell of a hasty wrap-up before the axe drops if anything.
Sure, but how often do we get a pretty solid or even great manga and then everything gets wrapped up with 3 plug-in chapters (or less even), the bad guys delivering some random speech that explains everything, and whatever is not explained plainly swept under the rug?
... shouldn't everyone be super-suspicious about their mascots now? ^^; dunno, guess I got the re-read the events of the last few chapters again, but seemed to me like it was pretty out in the open by now.
This chapter was... like the first chapter of an entirely new manga, lol.
Yeah, kinda like a detour; probably unplanned originally? "We want more volumes of this!", that sorta thing. And then we don't get a good end for the actual "plot" because it gets axed somewhere along the way ... ^^