One night at Yomiyama Middle School, something was sailing through the sky when it landed on the building.
At one of the houses, one of the class officers was staring out her bedroom window.
Just then, she saw a green glow and decided to go see where it was coming from.
"Yukari, where are you going?" her mother, Meiko, asked.
"I need to go for a walk!" Yukari lied.
"Well, at least bring your coat and umbrella in case it rains!" Meiko told her daughter.
Yukari went to get her coat and umbrella before going outside.
When she got to where she saw the green glow, she found the school.
It was still open for night classes.
Yukari took the stairs all the way up to the roof.
When she was on the roof, she didn't see anything.
She walked until she tripped over something.
When she got up, she saw a old green wooden mask.
"It looks really old! Maybe, if I go to the library, I'll find some information about it!" Yukari said, heading down stairs.
When she got to the library, she saw the librarian, Tatsuji Chibiki.
Yukari made sure he wasn't paying attention to her and ran to the back.
Then, she found a book on mythology and started scanning through it until she found a picture of the mask.
She found out that it belonged to the God of Mischief, Loki, and turned anyone who wore it powers beyond their dreams, hopes and wishes.
"This has got to be a mistake! It's just a plain old mask, right?" she told herself.
Then, she got a call saying her mother had died.
When she saw two classmates, Koichi Sakakibara and Mei Misaki she turned and ran down the stairs.
Soon after, she tripped causing her umbrella and the mask to fly out of her hands.
While she was falling down the first few steps, she fell face first into the mask.
While the mask was on her face, she fell on top of the umbrella which had a pin on it that went into her neck.
Koichi saw this and went to get some help.
While he was looking for someone, Yukari's body started spinning around in a mini-twister filled with thunder, lightning and wind.
When the mini-twister stops, we see Yukari transformed!
Yukari's hair remained the same, but her head and face down to the start of her neck was lime green, she was wearing a crystal clear bikini, and her breasts were tripled in size.
Just then, Yukari pulled out a mirror out of nowhere and gazed at her reflection.
"S-s-smokin'!" she said, excitedly.
Soon after, she heard someone coming and spun out of the school.
When Koichi returned with help all they saw was an umbrella and blood.
The next day, Yukari woke up to find her face back to normal.
When she saw the mask, she smiled.
"If last night happened, it will happen again!" she said, happily.
Then she waited for the sun to go down so she could become 'masked' once again.
To be continued...