Disclaimer: I do not own any vocaloids.
Rui POV.
I sighed. Even though Rin bandaged up my wounds, it still hurt…. Just then, I heard something shattering on the ground. My father had dropped his cup of beer on the ground again. Seeing me staring at the glass, he yelled, "Brat! Clean this up right now!" I lowered my head and said, "Yes sir." Bending down to pick up the shards, I heard Rin calling me. "Rui! I've got problems with my math. Can you help me?" Knowing that I should probably take care of the glass first, I responded with "I can, but wait a moment!"
After getting rid of the mess on the carpet, I rushed upstairs to see what problems Rin had.
Rin POV.
I put my pencil down on the workbook. I always hated math. Again, I wondered how Rui knew so much without going to school. She surely is a genius. Hearing the door open, I turned around to face Rui. She gave me a small weary smile before asking me, "So…what problems do you have?" I flipped open the workbook and said, "Umm…what's the perimeter of this circle?" She looked at it for a moment and said, "First, It's called a circumstance, not a perimeter. Second, you see here," She pointed to a line in the middle of the circle. "Its radius is 2 centimeters, so it's diameter would be-"
"4 centimeters." I said before she finished.
"Right," She confirmed, "The way to calculate the circumstance is the diameter multiplied by pi, which is-"
"3.14" I interrupted again.
Rui POV.
"3.14" Rin said.
"That's right." I said.
Rin scratched her head and said, "So 4 times 3.14….."
"Equals 12.56." I answered.
Rin gaped, probably amazed at how fast my reaction was.
"How do you know so much?" Rin asked in confusion.
I shrugged and said, "I like reading your textbooks."
If it's going to be a sad story, let it be sad to the fullest?