"Hiro, what are you doing?"
Suddenly while immersing himself in thinking, a saucy voice came from the door.
"Yui!"
Hiro called out happily. He knew exactly who she was just by her voice. His expression immediately changed to one of gentleness and happiness. The one standing in front of him was his little sister Yui.
Yui looked similar to Hiro with black hair and black eyes while having a very attractive face. She was wearing her school uniform which meant that she had just returned from school.
Yui Ernest, being Hiro's sister, was also granted protection by The Authority and she could stay at their headquarters where their parents are. Furthermore, they transferred her to a school near their headquarters.