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 Tweeny Witches. The single reached number fifteen on the Oricon weekly charts and charted for seven weeks.
Track listing 覚えてていいよ / Oboetete Ii yo—4:11 Composition: Tomoyuki Nakazawa Arrangement: Tomoyuki Nakazawa Lyrics: Kotoko DuDiDuWa*lalala—5:17 Composition: Atsuhiko Nakatsubo, Kotoko, Johann Strauss II Arrangement: Atsuhiko Nakatsubo Lyrics: Kotoko 覚えてていいよ / Oboetete Ii yo (Karaoke) -- 4:10 DuDiDuWa*lalala (Karaoke) - 5:17
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