- Adventure Mystery One shot Psychological Shounen Supernatural
- Other names: ルームサンマルサン ; Room 303 ; Room Three-o-Three
- Author(s): Ashihara Daisuke
- Total Chapter: 1
- Status: Completed
- Users Bookmarked This: 0
- Views: 1
Room Sanmmarusan
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Yukimaru and his friends investigate the Shiroyashiki as they look for their missing friends and run into the strange Room 303.