Keroro becomes very, very bored because he never goes out of the Hinata household, so Fuyuki and Tamama try to figure out a way to get the sergeant to get some sunlight, without revealing his secret! And when no other plan works, Keroro learns of the perfect solution to his problem at the end!
The Hinatas are feeling that somebody is watching over them when they're not in the house, and the most likely suspect is Keroro! So they secretly devise a plan to be able to catch on what Keroro does in the house when they're not there! However, the true answers prove shocking and the real suspect is revealed at the end, but it may be the last thing the Hinatas ever want in their house!
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