While we're at it, im gonna talk about whether the author intentionally made himuro say that she's only 2 minute 30 seconds late compared to the supposed yukimura say she's 3 minutes late due to a phenomenon such as time dilation. See when travelling at higher speed the perceived time will dilate to go slower as travel speed approach light speed, however since there's no way himuro can achieve anywhere near close to light speed while she's travelling to university the dilation would be very miniscule yet still exist. Therefore having a 30 seconds difference meaning that she would have to travel at a pretty fast rate and distant length meaning her house to university is pretty far apart and the clock that yukimura uses assuming its stationary at university aren't wrong and he's right that she's 3 minutes late. Anyway its a stretch but the fact that she showed her watch just got me thinking