The Light-Sea Emperor of Detective Conan

The Exchange Devil said that the world's essence was a trade of equal value. Guang Xi made a deal with the Exchange Devil. She had a wish that only a devil could grant. "What do you need me to do?" she asked. The Exchange Devil: [Protect the girls who exist only to make the protagonists shine, the ones who never get to live their own lives.] "Deal." Guang Xi's expression was calm and indifferent, as though nothing mattered to her. Yet she showed that person her warm, tender heart alone. […] [Hey, isn't that Red Witch acting a little strange toward you?] And those girls in your group, too... The Exchange Devil fell silent. The protagonist's orientation is set. See the very bottom of the table of contents for the pairing. The canon pairing remains intact, and there is a canon romance. There are affectionate friendships between girls, one-sided crushes from male side characters, and plotlines involving male characters from the original work. Kanto's white vinegar, Kansai's black vinegar, Edogawa's rice vinegar, Beihu's aged vinegar, the police headquarters' old vinegar, the agency's wine vinegar... vinegar jars topple one after another. [60% anti-piracy ratio, with a six-hour anti-piracy delay] Theme: Protect yourself, respect yourself, love yourself, stand on your own two feet, and live your own life.