Good game, and I was doing fine until Shinigami, gave me a bad end, right after the second encounter with Sophie. After a dialogue with her, she teleports to the MC's room and two options appear, one disabled and a time bar, regardless of whether I click on the button or not, the result is the same. Death. I read in the comments below that you need to grow in love with the Shinigami, but I didn't have many choices to see if that would happen.
The girls' levels are:
Helen - 8/0
Liz - 7/2
Yui - 5/2
Sophie - 8/1
Shinigami - 1/Inf
Kate - 5/0
Don't know why she has lewd = 0, I completed the motel with no problems.