For someone who's smart and could even be considered as a genius like Ranpo, it's not a surprise to know he thinks way differently than most people do. He thinks things through logically every time that causes him to see things that most people do not.
Being the agency's greatest detective, he's invincible. But none ever thinks of his sole weakness... Emotions, he was so emotionally constipated he doesn't understand normal social cues.
He doesn't get along well with those who don't understand him, he came off as aloof and very childish to most people. And as someone who can't understand emotions very well.
You were shocked when you felt soft lips touching your cheek, soon a donut with a bite landed in front of you with an almost empty box and a half finished cola.
You looked to your side and was surprised to see Ranpo smiling cheekily at you, as if it's normal between work colleagues to be so intimate like that.
Ranpo: What? I can't kiss my own partner?