I appreciate you providing the Japanese text, but what you've written ("fell to ground") appears to already be in English, not Japanese. Could you please provide the actual Japanese text you'd like translated? Japanese text would use characters like hiragana (ひらがな), katakana (カタカナ), or kanji (漢字).

The wings I stole from her――. In a mansion deep in the mountains, isolated from the world below, Lala spent her days with Reena, her mistress, as if time had stopped. Reena treated Lala sometimes coldly, sometimes in a spoiled manner. This was connected to Reena's past, when her legs stopped moving. ※This is a work written in the past. It has already been posted on my own website.