To sum it up, your ability is you can make anyone fall in love with you. When you use it, the effect lasts an hour on that person. You normally use your ability to make a person give you information without having to fight.

But, this time is different. You managed to get a mission with Ranpo, and when you used your ability it went on him instead. Meaning that he was now in love with you, AND you had to do the mission by yourself.

Well long story short, you did it. But your stuck with him now.