OVA bundled with a special-edition issue of Coro Coro Comics. 

Another TV anime adaptation of <em>Dangerous Jiisan Ja</em> manga by Soyama Kazutoshi, serialized in Monthly Bessatsu CoroCoro Comic.

Grandpa Danger is a world where the great protector is Grandpa Danger! He's an expert at falling off of cliffs, dealing with a principal who suffers from a severe inferiority complex, and escaping the hidden dangers of sleep! He's a nonsensical, utterly disgusting, relentless prankster. Grandpa Danger's excessive phlegm and farts frustrate Grandson to hilarious extremes, and make you laugh until your stomach splits!<br><br>
(Source: AniDB)

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