The premise for this vn is really interesting! Resurrecting your ghostly friend through an illegal item called the "Phoenix Tear". I can just imagine all the possibilities you could do with that. Like how the friend will react to the modern world (depending on how long they've been a ghost they could freak out a lot). Or if the friend needs a new ID since his death certificate has certainly been signed by now. A whole lots of possibilities.
Now for some of the other stuff. The password part I really didn't get, mostly because I was focusing on the part where MC mentions "18XX" or something like that. And thought the numbers were a part of the password some how.
Overall I had fun with this vn! Hope to see more of it!