"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 has entered the Hall of Fame.