Sgt. Frog Episode 61: Very Superstitious, Writings on the Rock-Stone Thing!
Episode 61 of 358 of Sgt. Frog, aired June 3, 2005, 25 minutes. Available with English subtitles and dub where released.
Episode summary
The new transfer student in school has amazingly bad luck. Could the lucky stone Fuyuki picked up as a small child hold the key to it? Hey, are Natsumi and Saburo-senpai about to be launched into space?! Source: crunchyroll