Monya,
15 years old, is an angel from the future - more specificcally, from the year
3872. Thanks to her special machine, the time spiral, she can return to
the past. That's how she meets Yoko for the first
time. Because Monya has now changed her past, she can never go back to her present
in the future. So Yoko's uncle Izumi and his wife decide to adopt Monya.
Since album no. 11, Monya has taken Yoko into the past several times.