Rising Dragon War Princess Tenmu

"Good work today!"
"See you tomorrow then~"
After saying goodbye to my clubmates at our usual spot, I walked home alone down the night road, letting the cool evening breeze wash over my body still hot from club practice.
—Not that anyone's waiting for me if I rush home anyway...
My parents are away on a business trip right now. Dad said he could go by himself, but Mom kept insisting, "Naomichi can totally handle watching the house alone!" and tagged along anyway.
Tch, she's probably just using it as an excuse for a trip...
My first time home alone was a clumsy mess, but now I'm actually enjoying it.
—What should I have for dinner...
—What did I eat yesterday again?
—Oh right, did I record that show?
Just as I was lost in random thoughts, a shadow suddenly crept up to my feet.
Moonlight poured down like water, and a man stood there, backlit.
He radiated the aura of a samurai and spoke coldly:
"I am Kenshin. Kenshin Shiranui."
"Since you have witnessed my true form... curse your own fate."
Hearing his words, I instantly understood my situation.
—I'm going to be killed—
Just then... I faintly heard a bell, and someone's... scream?
"Aiyaaa—!!"
The bright full moon suddenly burst with intense light, and something came plummeting down between me and the man.
BOOM!!!
Amid the explosive roar and flying dust, a figure emerged.
From the silhouette it was a girl, but her face wore three Hannya masks...
As I stood frozen in shock, an unfamiliar female voice echoed in my head:
『—Tenmu-chan~ Can you hear me?』
『—Perhaps this is the Earthling who can grant Tenmu-chan power』
The girl called Tenmu suddenly leaned in close,
"Here, take my hand."
The moment I somehow found myself gripping her hand—
"Armed Transformation!!"
At Tenmu's shout, the masks on her face shattered.
And I had actually... become the armor on her body!
"When the auspicious clouds summon the dragon to soar the skies, evil shall be utterly annihilated."
"The messenger of dreams and hope, Rising Dragon War Princess☆Tenmu, has descended!"
So Tenmu is a War Princess fighting the Shiranui Legion, who seek to devour the stars of the universe.
Hailing from a distant world, she will now battle the evil forces trying to invade Earth after the Heian realm!