主角馬修斯（Mateus）是個體弱多病的男孩，他從小就因為身患不治症而無法正常上學，甚至需要長期服用藥物來維持生命，他深知自己對父母來說是很大的負擔，也因此他盡量不對父母提要求，努力做個安靜乖巧的孩子。馬修斯其實很嚮往普通孩子的生活，他也希望能像其他小孩一樣，去學校讀書、去操場奔跑、和朋友玩耍，但這些他都無法做到，甚至曾經短暫上學交過的朋友也都斷了聯繫，雖然有復學過一兩年，卻因為被老師因生病為由「特別關照」而被排擠，但馬修斯回到家後卻對此閉口不談，默默在心裏承受。隨著年齡增長，馬修斯的病情也隨之加重，能外出的時間逐漸減少。他平時唯一的興趣便是讀書，還特別喜歡在茶餘飯後的時間與父母分享讀書心得，但不知從何時開始，馬修斯的父母越來越沒有時間陪伴他，甚至只會定期的買新書給他，總說沒時間聽他說心得，還不如多去休息。漸漸地，馬修斯對生活感到麻木，他感受不到存在的意義，失去了活著的希望，就在某次看書時，馬修斯眼前突然一陣模糊，醒來便發現自己身在一座華麗的圖書館，雖然想試圖走出去，卻發現那圖書館跟迷宮一樣，被困在其中。
The protagonist, Mateus, is a sickly boy who has been unable to attend school since childhood due to an incurable disease and even needs to take medication to sustain his life. He knows that he is a great burden to his parents, so he tries not to make demands on them and strives to be a quiet and well-behaved child.As Matthews grew older, his condition worsened, and he was able to go out less and less. His only hobby was reading, and he enjoyed sharing his thoughts with his parents. However, his parents began to spend less and less time with him, only buying him new books periodically, saying they didn't have time to listen to his thoughts and would rather rest. Gradually, Matthews became numb to life, feeling no meaning in his existence. One day, while reading, his vision suddenly blurred, and when he awoke, he found himself in a magnificent library. Although he tried to get out, he discovered that the library was like a maze, and he was trapped inside.
