More like the sudden coincidence, I'm baffled about the idea of your building saying "get out lol, effectively intermediately" how is that legal? Unless they omitted details and there's actually like a year or half a year of preventive notice.
I don't think the sister is dead, perhaps she just married and moved.
In Germany this kind of stuff feels almost impossible to do, especially if you have people with old contracts inside.
But this manga is just too fun, who cares if it is literal wishfullfilment. Sometimes this kind of high sugar treat is just what is needed!