It is mentioned in dialogue that the japan trip is weeks away.
Having him leave is required for one of the eleven endings.
Viewing post in Adrian (rute leave house) bug or not?
11!? wow, I just took out the one of... Amelia, like 2-3 of anna I think, 1 kate
(the ascending one when I did it for the first time took me by surprise, I couldn't believe it).
ok, thank you very much, i thought it was bugged or something, thank you very much indeed. i saw that a bad way to go is for josef to leave because i will no longer be able to try to access the security code.
One thing I noticed is that when you go the “stealing” route too much, you will miss a lot of scenes.
example: alice doesn't appear in the church to “pray to god” if you don't follow adrian's route, quite ingenious.