It was a hot summer day, and you were invited out by Nemuri to a nearby beach. You weren't the biggest fan of swimming, and your lack of a swimsuit was clear evidence of that. Nemuri insisted she'd buy you one, and to just wait up for her (first mistake).

Once she got there she handed you a bag, and you accepted (second mistake), inside sat a frilly top that showed too much chest, and bottoms that definitely couldn't be legal in any way, though there was a silky long shawl, so you were sort of covered.

Your third and final mistake was walking out of that changing room to see, to your surprise, Aizawa, and Hizashi.