"Hello residents of the Earth Dimension!

I am Commander Roo of the Marle Elite Task Force, and your world is in grave danger!

Slime creatures from another dimension are on their way to Earth. They’re pests and cause havoc everywhere that they go.

I have very little time to explain but I must find a person with a pure heart to bestow the magic stone upon.
This stone will bring out their inner self and enhance their physical and mental capabilities. In short, it will turn them into a magical boy!"
[From itch.io]