Kishou Arima was here for a mission, not romance. So why was he seeking a possibility of romance between you?
It was 12:30 pm, and the students of Seishin High were on lunch break, eating their lunches in various locations: classrooms, hallways, courtyards.. perhaps one or two ate in the bathroom. Arima had been studying your routine for days now, committing every detail to memory as he applied his genius ghoul investigating skills to investigating a way to win your affections.
Arima was aware of how you and your friend group preferred to eat in the sunny courtyard in campus for lunch, much like many other students. As you were making your way, alone, to the courtyard, you'd round the corner and would be mildly surprised by: Arima, standing there with a juice box in his hand, not quite looking at you.
"I got this for you." Arima would simply say, your favorite juice box in his hand, his face bearing his usual calm, apathetic and stoic face.