I remember that one.
It was part of a series of doujins...and the joke about new job was in previous one..
Ah here it is Well-Ventilated Workplace!!
As for Meiling doujins, I think The Sound of Bells is nice one.
End of the world?
I guess in this manga, when they can't just regenerate, Hourai beings were reincarnating. It's a notion that appears every now and then.
And the only way for Kaguya to reincarnate was to be born by Mokou.
Something like Yuri Crush? Romantic Interest? Dunno...can't really call it subtext when it's pretty clearly stated.
I wouldn't call whole series Yuri for one crush. For example, Azumanga...