>>4383277It's a reference to a little historical joke in Kantai Collection (the game the characters are from). The girl on the left in the Lawson store uniform is the aircraft carrier Kaga from the more experienced 1st Carrier Division and the girl on the right is the carrier Zuikaku from the less experienced 5th Carrier Division.
In the game, Kaga has 2 lines implying she sees Zuikaku as a kid compared to her and maybe looks down on her a bit. Or maybe she's just being tsundere. Depends on how you want to interpret it.
(Lawson did a collab with Kantai Collection in 2016)
