This series seems pretty out of order, it has been a while since the April Fools chapter where they discussed being second years. Now they are in this chapter. Wonder if this is to coincide with the anime or something.
@SamnJamn Yes the series is a little wonky in chronology. In Gessan the chapters print in whatever order Yamamoto draws them in, and when he places them bounces around between their first and second years. It's been like that from the start as you can see in a few of the gym related chapters as their tags on their shirts flip back and forth between class 1-2 and class 2-1. When the chapters get compiled into tanks, they are often reorders to be more chronological, which is why the numbering here on Dex is a confusing mess: ex. there's presently two Ch 90's here: the one in the 11th tank, "Changing Uniforms" and the one that ran as the 90th chapter in Gessan, "Blood Type", which has yet to be put in a tank; or the tease of them as married adults was Ch 31 in Gessan but is now Ch 36 in the tanks. Meanwhile "Revenge" which was originally Ch 52, is now 84 (volume 10) as of the tanks, which I think was the first time their gym shirts said class 2-1; but it's companion story with them still as first-years in Ch 51, "Fitness Test" ended up much further away from it in volume 7 as Ch 55
Look at this guy, casually dropping flirty lines like this. I was proud and then he went backwards and said they were in different classes. Nishikata, just admit it, that your fate has already been sealed