

岩の上に赤いヒトデがいました。
ヒトデは魚ではありません。
子どもたちは浜でヒトデを見つけて、喜んでいました。
"ヒトデ" is in the lesson "Sea world" (Level 15), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.