Liliam

(from ebookjapan):
Lilliam's father, Dr. Breminger, was a scientist involved in research that involved national secrets, and all the people involved were packed into the lab for days at a time. Her mother Olivia was concerned about her husband's research, as the family members of the researchers lived in isolation from the general public, knowing nothing about it, but little Lilliam had no idea what the adults were up to. Lilliam had been hoping to buy a new nendo, which had become hard, but by chance she came into possession of a shiny, beautiful, soft nendo, which turned out to be a dangerous weapon that was a matter of national security! Unaware of this, Lilliam touches the Nendo, and unbeknownst to others, his spirit breaks down and he becomes a demon incarnate. ......?