At around 11:30 in Episode 6 of 5-toubun no Hanayome ∬, Ichika offers to buy books for Uesugi. Uesugi just waits outside the store while Ichika is paying the check, then, when Ichika is done paying and go home with Uesugi, it's Ichika who carry the books on their way back home even though her hand's hurt. All the work here is done by Ichika alone and yet for Uesugi.
Is it the etiquette in Japan not to wait in line while your friend is paying in a store? You know, Uesugi could have been talking with Ichika while she's queueing and paying the money. Is this intended to be a sign that Uesugi is socially awkward?
Ichika carrying the bag and Uesugi putting both his hands in the pocket in a leisurely manner: