Maybe a bit late,but here it goes (it might as well help someone else)

Quick answer: Go to the church,choose the 1st option (cheer Shanice up) then go again,choose the 2nd option (mention the decayed state of the church),third visit choose the 1st one (Help them),fourth visit pick the 1st option (tell Priestbot to make the trip) and voilà,good ending

Now one than another detail. So the second visit where you see Gabriel from ULTRAKILL trying to seduce V1 with a robo-cosplay of himself  Ecclesiasticalot FF the answer is actually relevant for the good ending,maybe it won't seem like it since he mainly talks like a robot but he does have emotions so don't break the bag of gears' feelings or he will refuse to go to the Vatican and be blessed by Kaio Sama or something

After getting the good ending you'll have to go outside and use the "Go for a walk" option. Haven't tested if it has to be at a particular moment but my guess is there's no difference,just do that from time to time and after that the sidestory will continue. Be patient,remember there are a bunch of events that trigger after certain requirements,one of them may be time (including full days) and in this case the patch notes said it's 4 days (previously 7 days,thank you dear dev)

This is kind of punctilious by me but there's no difference if Anon (the character)...ahem...does his thing with Jun (the sexbot) or not after the first mandatory stream. If you help Shanice she will still find the "sticky substance" (it's obviously glue ¬_¬') when checking on the bot. I wish there was a change in dialogues or so

And I got shocked by that ending too,it was pretty awful.Although to be fair it happens in a church almost in ruins...on a dystopian world...where people don't even look at each other...like the name of the game suggests...and it's called "the worst ending". Yeah,there is barely any margin to imagine other outcomes. Also sorry for the excesive rambling