Two high-school boys run into each other, and find that they've swapped bodies.
This is a crossover between Ao Haru Ride and My Love Story!! wherein the primary male characters from each story, Takeo Gouda and Kou Mabuchi, bump into each other and swap bodies. I think I would have enjoyed this manga much more if I had been familiar with My Love Story!! (in the same way that I'm familiar with Ao Haru Ride). Cause, you see, the humor comes from these two polar-opposite characters doing things in each others' bodies which the other person would never do. We see Kou being overly expressive and constantly pursing his lips. My favorite panel has him with his face drawn inside his own mouth for emphasis. And of course seeing his butt in short-shorts. Beautiful. Then we see Takeo acting subdued and depressed, which is probably hilarious to those familiar with Takeo. It keeps milking this joke until the end. I think it works pretty well.