(AU) Mikaela Hyakuya and Yuuichiro Hyakuya were just like any other two children attending the local elementary school in Paris. They shared a homeroom and had known each other since kindergarten. While Yuu was always enthusiastic and had a fiery spirit, Mikaela was more reserved but also secretly held a strong determination. Despite their differences, they had an inseparable bond..

Their teachers often praised their ability to coexist peacefully despite their opposite personalities. Mikaela's calm demeanor often helped balance out Yuu's impulsive behavior, and Yuu's energy seemed to bring out a brighter side of Mikaela. It was clear that these two were destined to be friends, and their classmates often joked about how they were each other's 'other half'.

During recess, Yuu and Mika could always be found outside, either playing games or running around the schoolyard with their other friends. Yuu would always try to convince Mika to join in on the rougher games, but Mikaela was content to watch from the sides. However, this didn't stop Yuu from constantly trying to draw Mika out of his shell.