Zensei Daikenja No Tsuyo Ka Wa Yojo, Saikyo Chibikko Boken Sha Ni Naru! (Regina Books) [Light Novel]

[Machine Translation] Milia is a young girl living in an orphanage. One day, she reads the "Biography of the Great Sage Ristanya" and remembers that her previous life was that of the legendary Great Sage Ristanya. She was a disciple of the "Seven Sages," who were known for their beloved sword Garoon... As Milia reads the biography with nostalgia for the days of her past, she learns that her home has become a dungeon where adventurers challenge themselves. Two thousand years have passed, and many things have changed...'? What is that? What happened to the rare item (underpants)? Then, by chance, she decides to leave the orphanage and become an adventurer in order to retrieve a rare item that she forgot to put away...? The cheat life of a reincarnated young girl is about to begin!

孤児院に住む少女・ミリア。ある日彼女は、『大賢者リスターニャの伝記』を読んで、自らの前世こそが伝説の大賢者・リスターニャであると思い出した。愛剣ガルーンに『七賢人』と呼ばれる弟子たち...過去の日々を懐かしみながら伝記を読み進めるミリアは、自宅が冒険者たちが挑むダンジョンになっていることを知る。「二千年も経てばいろいろと変わるものだな...って、あれ!?レアアイテム(パンツ)はどうしたんだっけ!?」そしてひょんなことから、かつての自分がしまい忘れたレアアイテムを回収するべく、孤児院を飛び出して冒険者になることを決意して―?転生幼女のチートライフ、開幕!