When you first enter Grey Lords Mansion, you can only enter the far end door on the right. Go in there. There will be a lot of other doors. Take the path to where the green golem things are located. Go to the far end. You will fall through a hole. Then, go to the door on the right. You will see a coffin. Press X on it and you will enter/ You will see Myotiysmon lying on the ground. He will tell you to get meat. He will also give you a key. Go to the refrigerator and you will see the memo. You now have to go outside the mansion. You will see a steak. Pick it up and enter the mansion. If you forgot how to reach Myotyismon, go up the stairs and go to the door on the left (with the circular bar in front of it). You are now in the study again/ Go to the door on the left. Press X on the coffin and talk to him. He will then invite you to dinner. He will tell you how his men are not obeying him anymore, then he will tell you he will come to the city but he still has research to do.