Hello !
Recently in another post I've written this link :
どらねこさんとぼく3
It's a story for children I suppose because it's written only in hiragana.
I think you can find that kind of text with Google.co.jp for example, when you type something like "hiragana dake" or "only in hiragana"...
But of course it's better to write it directly in japanese, because most of those sites are written by japanese people for japanese children...
If you can't I can write here some useful words like "hiragana only", "children", etc...
But I agree that finding a such site is sometimes difficult... but sometimes you find one. For example I've just found this one :
Mediaship School Web 小学1年生むけのホームページ
it provides other sites. Some of them are written in hiragana only, like this one :
ようこそキッズメイト城へ
You have to choose "ひらがなのページはこちら" which means, "click here to access the hiragana page" (literaly : "hiragana page, this way !")
I've visited this site a little, and there are a lot of mini-text... perfect to learn hiragana and vocabulary I think...
Ganbatte ne !
I can't read well enough to search for them.
