Self-Contradiction

It's been over sixty years since the first Gates, from which monsters spill out, opened. One day, a junior colleague who had suddenly disappeared to the Otherworld—the realm beyond the Gate—returns, completely covered in blood. Seeing him after so long, the protagonist, Kim Hyunsoo, raises a hand to greet him, happy to see his face... but the junior responds: "How could you wave your hand and say you want to grope my butt when there are so many people here, Senior?" "......Excuse me?" "I missed you, Senior." Thanks to this junior who abruptly intruded into his life, peace has become a foreign concept in Kim Hyunsoo’s home. "I'll only lick it once in the morning. If you give me permission...