Knocking

I was solving a mysterious and unusual case. It was really dark, whole the town was seemingly overnight. I knocked to door of some house and after a while an asian woman in early twenties opened and let me in. We were sitting in a dark room, the only light that came inside was from a street lamp. We talked for a while about that strange case. I told her that every clue led me to her house. After I gathered all information I could, I left her alone and went to the streets. Then I found myself in some old storage and industrial buildings. I felt that I was in grave danger, being chased by someone or something. I escaped, running through dark corridoors, rooms, alleys and then through sewers I got to subway station and escaped. Later I found myself in that buildings again, but this time I knew exactly where to escape. Next night after solving the whole case I went to a chinese noodle stand and talked with chinese man. I told him that I am leaving the city in search of a crystal katana sword. The man was surprised that I knew ultimate secret and asked who told me about it. After a while of consideration I said "MoonMan". Then he gave me a beautiful white flower that had blue glow inside it. I quietly said the name of that asian girl I met when solving the case, said that I might stay for some time and went to her. I gave her the flower and said "I know that this flower cannot surpass your beauty, but take it." Then I said that I am staying in the city and asked if she would go on a date with me. She was silent, after a while she said that she has troubles speaking. I said that she should call me and say whether she want's to meet with me or not, then I went away. I found myself in some old barracks, it was really dark. There was a really huge, open cistern down to the bottom of earth, full of muck. There was a platform with crystal sword, glowing with blue light. I decided to not risk it and leave the room. I opened door and saw that chinese noodle seller. He was really scared. I could not move - something was holding my arm. I turned back and saw a huge, white skinned humanoid with circular maw full of teeth in the middle of it is head, with two small eyes above it. The monster lacked left hand. I tried to free myself and scare it with roaring, but when it did not worked I just punched it in the maw. Everything became dark. I saw a text saying "The monster disappeared. No one knows how it was able to get through 890 345 600* metres of solid rock." *The number can be inaccurate, but it is close I think.