How to Succeed In Pekopon-Conquering Without Really Trying!

Kururu passes on to his platoonmates his new 'life policy' - do something you don't normally do. After seeing Natsumi and Fuyuki react to Kururu's revised behavior with gratitude, the other Keronians take to this new attitude with great zeal - Keroro in particular gets the wrong idea and winds up doing a lot of needless and ultimately annoying things.

Synopsis excerpt via Kitsu.