We are childhood friends who live next to each other in an apartment building. We grew up like brothers and didn't think of each other as the opposite sex, but after losing a game and being punished by Nenne's breasts, we suddenly started to notice each other. Then, one day, the two of us decided to stay home and watch the annual trip that we take together, due to the risk of contracting an epidemic. And then, we finally crossed the line...