Witch Trial: Starting by Turning the Warden

Right after finishing the Class Trial, Ibuki was tossed straight into a Witch Trial dungeon. She thought it would be another hellish start, full of mutual suspicion and people getting their heads chopped off. But when she looked up, she saw the ugly-cute warden, who seemed just as keen to slack off as she was. A fight to the death? Not happening. Nobody has a motive to kill, and as long as you get along with everyone, you can live in peace until you're old. Isn't this the legendary ultimate retirement dungeon? Since nobody has to risk their life, the goal is clear. Instead of dating her, make her swoon. First, persuade the warden to join my side, then turn the entire prison into my happy home.