Everything was a nice day, at the tafuta Guard Successor Foundation, and Natsuki was touching buttons on inventions, as she was told not to. Then, she was getting bored, and left the room,
Later, when Masumi and the gang entered, They were shocked/appalled.

Masumi: what happened???!!!
Sakura: (sigh) Natsuki, happened.
All: NATSUKI!!!!!

Later That Day,
A new invention arrived,
Mr Voice: Everyone, gather around behold the new personality changer, it can change any personality, kwa pressing the blue button. and when wewe press the button, it sprays a person.
Souta: So can it work on anyone, including Natsuki....