Hiyama sighed in disapproval at the paper he held in his hand. The answers written on it were pitiful.

He was unable to understand how basic addition and subtraction were forgotten by his careless student.

2+5=9

Hiyama wondered if the girl was actually making a positive effort to act stupid.

He remembered Kaai Yuki as a child. She was a cute little girl who wore her short hair in two pigtails and was always found in a red pinafore. She was a fairly bright student as far as he remembered, and though her weak point was math, she was able to score fairly well is what he had heard.

But now, taking up teaching and ending up as her math teacher, he wondered what exactly was going through her mind when she wrote her tests. For a paper on 20 that he had assigned the class, she had scored all of five marks. The rest had all scored above fifteen. He had to hold her back for supplementary classes....

Yuki walked into the class. Her hair was left loose and fell in soft layers down to her back. She had a light amount of lipstick, eye shadow and liner on. Her uniform shirt was casually worn, with one sleeve folded up, the first three shirt buttons open, and untucked. She wore her skirt high so it looked almost as though she had just walked in with nothing but a shirt on. She walked up to her seat near the window and was about to sit down when Hiyama entered the classroom.

He was on her case as soon as he set eyes on her.

"Yuki! Tuck your shirt in and wear your skirt lower! Button your shirt and pull down that sleeve! And how many times am I to tell you to tie up your hair! It's all over the place!" He snapped.

"Shut up Hiyama!" Yuki grumbled as she produced a rubber band and tied up her hair. She then proceeded to fix up her clothing.

"And you're not going home till I say so! You're having supplementary classes!" Hiyama informed her.

"Aaw c'mon Hiyoteru! I was planning to go out with my friends today!" Yuki groaned.

"Don't call me whatever you feel like! Especially within the school grounds you are to call me Sensei!" Hiyama said angrily. "And you are not going back nor going out with your friends after school till you improve!"

"Damn you Hiyama!" Yuki rolled her eyes and sat back down after adjusting her skirt.

Hiyama gave a low, annoyed growl and went up to the table at the front of the classroom, setting his books down.

Hiyama had known Yuki from the day she was born, their families being closely acquainted. Hiyama would go to her house often and he loved playing with the little Yuki. She loved playing with him too when she was little. While their parents would talk inside the house, they would play for hours in the garden, ignoring the age gap of thirteen years.

But Hiyama went abroad for his higher education so the both of them grew apart. Hiyama had always been bent on becoming a teacher, and he was determined to teach only in his hometown. So after getting his degree he returned to teach in the very school Yuki studied in to find that she had become completely different from the cute little girl he'd known back then.

The strange part was that whenever he asked the other teachers about Yuki, they would give a very good report, telling him she was a sweet, smart and studious child. Her previous math teacher especially insisted that she was a star at the subject and that if Yuki was failing math, she was doing it on purpose!

Hiyama wondered why she acted in such a manner in his class alone...

He shook the thought out of his head and greeted the class. His students greeted him back in a tone that suggested they were not happy with the fact that they had Math in the very first period.

"Today we shall start a new chapter- Trigonometry." Hiyama said, writing the word "Trigonometry" on the board and drawing a right angled triangle below it, slightly more to the left. "Now, Trigonometry deals with right angled triangles, for those of you who didn't know. We deal with three basic functions and their inverses in this chapter. Can anyone tell me what they are?"

A boy raised his hand and stood up.

"They're Sine, Cosine, Tangent, Cotangent, secant and cosecant!" He said confidently.

"Very good!" Hiyama smiled and asked him to sit back down.

"Now, as we all know, a right triangle has a hypotenuse, which is the largest side, a perpendicular and a base. Sine can be abbreviated to sin..." He stopped speaking when he heard soft snores reaching him. He looked back to see Yuki fast asleep with her head resting on the table in front of her, using her math book as a pillow.

"Someone wake her up..." He sighed.

The girl sitting next to her shook her up and she sat up groggily.

"Ugh...where am I?" Yuki shut her eyes tightly and opened them a few times, stretched and yawned.

"Yuki, come to the front bench this instant." Hiyama said sharply. Yuki's cheeks reddened. She muttered a "Whatever.." in an attempt to seem nonchalant but Hiyama noticed guilt in her eyes, along with a hint of....happiness? She took an empty seat in the front of the class.

Hiyama continued with the lesson after giving her a look of disapproval.