Twin Signal, written by Sachi Oshimizu, is a manga TV series which
follows the tale of a young boy and his robotic humanoid which was
created for him by his grand-father. The robot is an adult one, but due
to a mistake in his creation, whenever his master sneezes he turns into
child-like version of himself, obsessed with chocolate. The fun times
are threatened when another robot appears on the scene and takes a
dislike to the hero.