The Boss of the Horror Game Is My Dead Boyfriend

The Heroine Pretends to Be Melancholy and Travels into the Horror World, with CP

I read a book before, where the heroine pretended to be very melancholy when she traveled through a dungeon world. That dungeon world was Tokyo, Japan. On the first night, she met Sadako and cut his bangs. On the second night, she met a dank male ghost and changed him into a suit.