Ah yes, the classic Japanese "girl with a weak constitution."
That trope is lame. They know about medicine in Japan, they should give a REASON if the girl is kind of sickly.
FFS Japan, you don't get a cold by being wet or cold. Although he did appear fatigued at the beginning to maybe he caught it on the trip. That would make more sense anyway.
I'm sure most of you are aware of this but I'm just gonna post it anyway
hikikomori
n. The phenomenon whereby an individual becomes a recluse from society, typically confining him- or herself to the house or a single room for a very long period.
n. A reclusive person of this kind.
So her name...