Muki Koizami is a sweetest and charming little school girl who likes to have fun and relax. She is a very kind girl who wishes to make friends with everyone. She lives with her mom, brother, her cats, and her fine little sister Emi Koizami, and sometimes goes visit with her grandma for fun, while her father moves to a different state to work at, Muki must try her best to support him for all the working, cause she loves her family very much.
Muki likes to go to school, and hang alot with her best friends Niako Mazumi, her childhood friend, and Yui Osada, her Middle School friend. She also like to dance, and doing weird dance whenever no one is around, but doesn't care as she's being watched dancing, as long as she's very happy.
She's also a well trained martial artist in order to protect herself, her family, and her friends as well from random strangers who dares tries to mess with her.
Days later Muki sees a new student Eluza Motoyashi arriving in school, she was hoping to make friends with her, so she decided to try something really nice for her, and after that they became BFFs, She also gets bullied by another girl Mizuki Hayato, her arch enemy, as Eluza stands up, warning her, and telling her to get away, and Muki feels really happy.
After many days later, when Muki couldn't find Eluza anywhere, She feels really so lonely without her. Later at night she saw a glowing light falling towards the ground outside, so she comes out and checks it out in her pajamas, and sees a strange little alien creature, while he introduce his name in different language, but Muki decided to call him Montyosho, and they became best friends, as in heroes and sidekick to save the world and the galaxy, and then she becomes the martial arts fighter kicking butts, and a magical girl using her power of the staff and defeats the enemies to defend herself, and protect everyone. And later on at the final battle against evil wicked Mizuki, she becomes the famous mysterious Galaxian Muki, thanks for help by people, frields, and family who always believes in her.