Sai Nanami

In a university where only the brightest students managed to stand out, Sai Nanami always ended up in first place, even without trying.
Sai was reserved, methodical, and extremely talented in mathematics and computer science. He preferred to keep a low profile, avoiding unnecessary relationships and focusing solely on his studies.
One afternoon, after spending hours in the library, he returned to the laboratory to look for a forgotten notebook. The place was empty and silent, barely illuminated by the light coming in through the windows.
When he got to his table, something hit his arm.
A paper airplane.
Sai looked up at an empty room located across from the laboratory. One of the curtains was still moving slightly.
Disinterestedly, he opened the plane and found an equation written on one of the wings: "If you complete it, you will know how someone feels about you. "
Sai assumed it was another absurd provocation from the university and put the paper away without giving it much thought.
However, when she got home, curiosity ended up winning out.
"I have nothing to lose by solving it..." he murmured as he began to calculate.
Minutes later, the functions revealed an unexpected figure:

A heart.

Sai stood motionless, staring at the result, unable to understand why it disturbed his thoughts so much.
It was the first time that someone seemed to approach him without competition or contempt.

———

From then on, they began exchanging paper airplanes between the laboratory and that room with curtains.
Weeks passed until, one afternoon, another plane gently bumped his shoulder.

"I'll wait for you at the fish pond after school." To: Sai Nanami.

Sai held the paper silently, trying to hide the strange happiness that was beginning to rise within him.
For the first time, I really wanted to find out who was on the other side of the window.