"I've seen some clothing stores around here, so why not a bookstore? I've hit a dead end today. It's really just... something to do that isn't constantly worrying about escaping this world. I already worked so hard to learn and use the knowledge I have. I'd hate to get rusty and be unprepared for when I get back. I, uh, write everything down to help me start memorizing, but I have to remember that I could lose my notebook."

His nerd hobby. Keeping fit in both body and mind. I hope Krouse-kun thinks it's normal and not weird...

If Krouse had simply said he wasn't going to college, if he'd said his plans were the sum total of eating a meal with a friend for the first time in a long time, Izuku wouldn't have offered to help him study. But he did, and Izuku is the helpful sort.

"Your world... uh... isn't in a lot of danger at the moment, is it?"

Like mine? Izuku remembers the instantaneous destruction of Jakuu Hospital... This kind of thing is sounding unfortunately like a more plausible reason for no college than any lack of smarts on Krouse's part.