No. More likely she has tachycardia caused by anxiety and dehydration.
Edit: It should be noted that Aya had gone from walking outside in February cold, to entering a very warm subway car. The sudden shift in temperature caused her blood vessels to undilate, creating a normal drop in blood pressure. Her heart had to increase its beat rate, and because of her stress levels and irregular diet, it went beyond a normal rate.
I dunno. I live somewhere where it gets to -35C, even -40C is not unheard of, every winter, and I've never heard of such a thing. And I go outside for a walk every freaking day.
You'd be surprised, shifts in temperature really do have large effects. Heart attacks are more common in winter, because the cold will raise blood pressure which can be harder on the heart and also loosen plaques that can cause blockages.
Anxiety is the main problem here. I know this from personal experience having had a couple of panic attacks in my student days with an accompanying accelerated heart rate. These happened after days of little sleep and irregular eating/limited fluid intake. Aya is pushing herself to physical exhaustion and her heart is in a borderline state. The sudden transition from a cold to hot environment simply pushed her over the edge.
This kind of anxiety related condition is very common in students. During the February exam periods, hospital ERs in Japan are probably full of students suffering from anxiety attacks, stress related conditions like hypoglycemia and anemia, and accidental overdoses from stimulants or other substances that people overindulged to stay awake etc..... In any case despite her embarrassment, Aya would have found plenty of company in the ER waiting area. The ER procedure for her is pretty straightforward: she would given an EKG by hospital staff as a precaution, and upon discharge she would have been sent home with either orders to get a normal amount of sleep, or been prescribed an OTC sleeping medication like diphenhydramine HCL (better known in the States as the active ingredient in Benadryl, Nytol, and Unisom, among others).
Providing of course that she has a normal EKG readout. But this isn't that kind of manga. Expect plenty of angst over her perceived failure to "keep up with" Mitsuki.
last edited at Jul 14, 2025 3:22AM