Della has three great highlights in her life.
The first was when she took an IQ test at age seven and got the highest score in the room. A man in black took an interest in her and brought her away, turning her from an orphan into the adopted daughter of the second-in-command of a criminal organization. From then on, her life was on the rise.
The second was her first mission, when she single-handedly dragged the whole team down and let the undercover agent her adoptive father's archenemy had been longing for slip away. From then on, the incident became a thorn in that archenemy's side.
The third was sleeping with the organization's most famous ice-cold beauty on her eighteenth birthday. He was also her teacher and nominal guardian. She had to admit, it really was a pretty great experience.
Japan no longer offered her a challenge, so Della dusted herself off and boarded a plane to Hawaii, where she had booked three years of advanced training. When she returned, she would be the organization's most fearsome female demon!
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Rei Furuya has three great humiliations in his life.
First humiliation: As the top graduate in the history of the police academy, he lost horribly to a fourteen-year-old girl in an IQ game on his first day undercover in the organization. From then on, he never won against her again.
Second humiliation: He worked diligently to build his career, carry out missions, and improve his standing, but the organization only gave him the role of a live-in nanny, dumping a troublesome girl on him to raise. Every day, he was either being summoned to school to meet with her teachers or on his way to do so. He put his heart and soul into raising her, only to be criticized by his superior: How did you manage to raise the kid so badly? Heavens knew, the kid was already a disaster to begin with!
Third humiliation: The child he raised slept with him. Then she took what she wanted and ran off without a trace.
As it turned out, before you do something bad, you should always leave yourself a way out.
Theme: Respect your teachers and honor the way of learning.