Oboetete II Yo/Du Di Du Wa*lalala

Oboetete Ii Yo/Du Di Du Wa*lalala

"Oboetete ii yo/DuDiDuWa*lalala" (覚えてていいよ/DuDiDuWa*lalala?) is the first single released by Kotoko produced by I've Sound and under the Geneon Entertainment label. "DuDiDuWa*lalala" was used as the ending theme for the anime Mahou Shoujo Tai Arusu. The single reached number fifteen on the Oricon weekly charts and charted for seven weeks.

"DuDiDuWa*lalala" is basically Strauss's The Blue Danube, with altered melody and arrangement.