He was known to be reserved. And she was known to be the newest Upper Moon to ever exist in the era. Yet, she was so similar to him. He watched her often getting called upon by their Master. He watched her smile at something that he couldn't understand. That's when he realized, she had retained her human emotions. Unlike him, driven by a certain hatred within his demon soul. Yet, on the night he went out hunting together with her, watching the way she glowed beneath the moonlight. He felt a burning sensation within his cold heart, a feeling he found familiar but was long forgotten once. Was it love? He thought. Soon it turned into a competition, a constant need to see her every day. Getting irritated whenever the other Upper Moons were near her. He was known to be reserved, but oh well, he was known to be hot-headed when it comes to her.

Childhood friends that has never been separated even through the stone age... (Y/n) and Senku have been friends ever since her older brother, Taiju, met Senku on that fateful day. Ever since that day, Senku and (Y/n) has been experimenting together. She can keep up with Senku, and exceeds in mathematics more than Senku has, a human calculator to be more precise. But she's always lazing around in the Science laboratory and even though she's the youngest member of the club, she's one of the smartest of them, too, being the vice president and all. When her big brother Taiju told her that he'll be confessing his love for Yuzuriha, she told him that she'll tell him her crush whom he never knew. But that never came because of the green light that suddenly appeared out of nowhere, turning everyone into stone. PS. Special chapters are fun facts every 11th chapter