Detective Conan: I Raised Gin, Then Ran Away

[System + two male leads + pure darkness + Gin as the older brother] Love has always been an unfathomable thing. A ruthless older brother spends ten years scheming to protect his younger brother, only to be repaid with endless resentment. A lovesick woman gives up her freedom to find her beloved, only to be rewarded with a final, heartbreaking separation. A proud detective gives up his dreams for the sake of his loved ones and the woman he cherishes, infiltrating the darkness. But the price is that he must spend the rest of his life as a stranger, able only to watch from the shadows. A righteous young police officer must choose between the light and the woman he loves. He chooses to shoot her with his own hands and die alongside her. After losing all hope over her sister, Miyano Shiho manages to survive in the light for a few years, but eventually returns to the cold laboratory and becomes the ruthless Sherry once more. Zero of the Japanese Public Security Bureau loses his four best friends. When he does everything in his power to avenge Hiromitsu, he discovers that the culprit, like himself, was merely a pawn. As FBI agent Akai nears death, he sees the two most important women in his life again. Only then does he realize, to his shock, that all his pride means nothing in the face of absolute power. As for Mo Feibai, he split into two. One half is a lovesick man who gives up his freedom to seek love in another world, stopping at nothing to get what he wants, only to end up forever losing the one he loves. The other half was born from a wish. He was once innocent and carefree, but endured endless torment throughout his childhood. When the wish was fulfilled, he vanished, leaving him forever separated from the one he loved. The Black Organization is merely one form of a greater force. As long as humanity's desire for immortality endures, it will remain in this world. It is all just a game played by those in power to while away their leisure.