Bi Ashi Mimic, Harumi San Tensei Monster Isekai Nariagari Densetsu (EARTH STAR NOVEL ESN139) [Light Novel]

[Machine Translation] I found myself in a treasure chest type monster - a mimic. And I was in a dungeon surrounded by monsters, and when I was placed on the first basement floor, adventurers suddenly arrived! I tried desperately to escape, but then I started to grow arms and legs.... What am I supposed to do with that? I was wondering why the adventurers suddenly started to split up, and one of the surviving bandits turned to me and said, "This is Mimic. This is a story about a girl who became a mimic and rose to fame in a different world because of her uniquely beautiful legs.

気付けば私は宝箱型のモンスター―ミミック―になっていた。しかも、周りはモンスターだらけのダンジョンだし、地下一階に配置されたらいきなり冒険者がやってくるし!もう何がなんだかだけど、必死に逃げだそうとしたら、なんか手足が生えてきた!...いや、それでどうしろと?と思っていたら、なぜか急に冒険者たちが仲間割れを始め、生き残った盗賊が私に向かってこう言ったのだ。「すばらしい」これは、ミミックになっちゃった女の子が、たぐいまれな美脚を手に入れたことで、異世界で成り上がっていくお話。