Seita has started going to temple school, but it looks like he's finding it hard to fit in with the others. Apparently the reason lies in Hinowa's extravagant stacked lunch boxes, but Hinowa herself doesn't understand that at all. As such, she makes Tsukuyo make lunch for him, but...
And the postscript has 
nothing to do with lunch.
ولا علاقة للملاحظة بعُلبة الغداء البتّة
El postdata no tiene que ver con el almuerzo.
E o PS não tem nada a ver com comida.