Hm-Hm-Hm-Hm...
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Artist's commentary
Hang in There, Kogasa-san 2082
I really didn't understand very well why he was buying those. :-)
In Hong Kong, they sell SIM cards good for 5 days and 1.5GB of data communication (and they have other types too), which you can buy just by paying money as normal, so it's nice to be able to buy a replacement right away when you've used up your data capacity.