Hi Hi Puffy AmiYumi: Season 1, Episode 6
Opera Yumi/Save the Farm/Pen Pal (17 Dec. 2004)
In "Opera Yumi", Yumi's old teacher brainwashes her into singing in her new opera. In "Save the Farm", the band tries to defend Happy Acres Farm against a greedy developer. In "Pen Pal", Ami's new pen pal isn't all he's cracked to be.