Sgt. Frog Episode 126: Keroro & Natsumi, Which Way to Heroes?!
Episode 126 of 358 of Sgt. Frog, aired September 8, 2006, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Kululu invents a device that can allow people to enter videogames! Most of the frogs and Natsumi eagerly dive right in. But Giroro can`t stand to let Natsumi rescue the prince, Keroro`s too busy looting to level up, and why is Dasonu Maso the one giving out quests? Source: crunchyroll