Sgt. Frog Episode 148: Koyuki, Historical Theme Wonderland / Keroro, The Mysterious Mouse of the Fantasy Wonderland!
Episode 148 of 358 of Sgt. Frog, aired February 16, 2007, 25 minutes. Available with English subtitles and dub where released.
Episode summary
It`s old-timey thrills and chills for our frog friends, when the gang visits Historical Wonderland! Source: crunchyroll