There was a town named Welvant where many universities exist. A boy named Aaron has moved to an apartment near the university to attend a university named University of Welvant in the town. A letter was put in a mailbox in his room on the day when he has moved to an apartment. <I am Mary in the next room. Please be nice to each other.> was written on the letter. When he had move, he came across the girl who lives next to his room, and he thought the girl delivered a letter. And when he went out of the room in the next morning for him, she had just gone out of the room too. Aaron pointed to his room and said “I am Aaron which has moved to a room there” “Are you Mary?” The girl said “I am Nadia” “Your room had a story behind it” Aaron asked “Eh?” Nadia said “Be careful” and went away hastily. He has gone out to shopping. He who went home found a letter in a mailbox. <What did you buy? From Mary> was written on the letter. Aaron said “Who is Mary?” “Though my room is a corner room, where is her room?”, then he heard the sound by which a letter was put in a mailbox. <Thank you for calling my name. My room is your next. From Mary> was written on the letter. He went out of his room, but there was no one. He closed a door of his room, then a letter was put in a mailbox. Then a letter was put in a mailbox. <I am here. From Mary> was written on the letter. But he found a door near the door of his room. When he opened the door, a lukewarm wind blew through from the other side of the door. And he set foot on the other side of the door cautiously, then a door closed suddenly. The girl with a baked and addicted face appeared. The girl said “I am Mary. Thank you for coming” Aaron said “Please take me out from here” Mary said “Be my friend” and has approached him. And he was shut in her room. Mary was the girl burned to death by the fire which occurred before about 50 years in his apartment. There was a rumor that she seems to have been confined to a room.