"Doushite-chan's Theme" is an original song featuring Hatsune Miku.
This song is a theme song for Pinocchio-P's character, Doushite-chan. Doushite-chan is a mascot character created by Pinocchio-P. Doushite-chan appears whenever there is a question and uses its razor blade to cut deep into a question it cannot understand.
Doushite-chan's gender is unknown and its tail is the shape of a question mark. Its name means "why".
This song is featured in Pinocchio-P's albums, Obscure Questions, manga, Matsuri Da Hey Come On. A remix by Pinocchio-P featuring Hatsune Miku is featured in Pinocchio-P's album, remix. A remix by itikura featuring SF-A2 miki, Megurine Luka and Sekka Yufu is featured in itikura's remix album, The Itikura's Remix Album -Mushroom Mother-.