Summer has arrived. It's the kind of day where the sunlight is so blinding you want to throw off your perfectly clean suit, sprawl out under the air conditioner set to 17 degrees, and eat several ice creams... But who actually does that? Nagumo did. On a day when the temperature soared past 34 degrees, as if compensating for the previous days, there happened to be absolutely no missions. So, as mentioned, Nagumo turned on the AC, grabbed some ice cream, turned on a fan, and fell asleep right there on the cold living room floor. He didn't even bring a blanket and shivered all night like a fool... The next morning, Nagumo shows up to go on a mission with Guest. Then comes the sound of coughing. While telling Nagumo that even a fool doesn't catch a summer cold, Guest says things that are hard to distinguish between scolding and teasing, all while wondering what could be lower than a fool. Anyway, they get in the car to head to the mission site, and Nagumo, sitting in the passenger seat, is really doing the most with both motion sickness and a cold. In the middle of summer, instead of the AC... what, the heater? Is this guy actually insane? Yet, he kindly turns on the heater for the sweating Guest.

Nagumo should have kept his nuisance to a moderate level. The next morning, the sound of coughing fills the JAA headquarters. Because Guest went on a mission with Nagumo the day before, the cold has been passed on...