Context: an old man saves a cat from truck-kun and ends up getting killed in the process. The cat, thankful, puts him in the body of a young girl, then explains the situation to him.
sono karada ni tsuite wa {moushi-wake nai} to omotterunya その体については申し訳ないと思ってるニャ About that body, [I] feel {sorry} meow. I'm sorry about you ending up in that body, meow.
chikakuni {tegoro na} nikutai ga nakutenya~~... 近くに手頃な肉体がなくてニャ~~・・・ There weren't any {suitable} bodies nearby, [you see], meow~~.
~ga nakute na ~がなくてな - "there weren't [...], you see."
{zan'nen da} kedo moto no karada ni wamou modorenai nya 残念だけど元の体にはもう戻れないニャ {It's unfortunate}, but you can't return to your former body anymore, meow.