Prison Bars Key
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The Prison Bars Key (Japanese: てつごうしのカギ), also known simply as the Key (Japanese: カギ) is an item in Densetsu no Starfy 2. It is found in Large Tree's Forest (Stage 5-5), where it is held by Puchi Ogura #5. In the story, Moon informs Starfy and Moe that Mitsugasago was kept behind bars. Starfy must find the Prison Bars Key and use it to rescue him.
Starfy must use his Star Spin to hit Puchi Ogura #5 and retrieve the key. Puchi Ogura #5 will try to catch Starfy for 20 seconds. After 20 seconds she will give up and Starfy gets to keep the key. After freeing Mitsugasago, the key can also be used to open the door that leads to the next room.