Let me state in advance that we love Rourou and Miao Miao, but I watched "Up to the Sky" a long time ago (we were not a fangirl at that time).
When I watched it for the second time, I felt that there was too much nonsense (the "nonsense" here refers to plots other than ID, cough cough), so I didn't have the patience to watch it completely the second time.
But I really, really like the I and D in it.
Thus, this article was born.
That's to say, the character's personality may not be well grasped, so, 1. The campus is empty; 2. Enter with caution.