Orihara-san once again dons the uniform, but things don't go quite as planned! An all girls (around thirty) party leads to all sorts of adult conversation, and Orihara-san's sister ends up asking Momota-kun for love advice?! Saki gets some help babysitting her little brother when she has an unexpected run-in with a certain someone. Also, summer heats up as Momota-kun goes on his first festival date with Orihara-san, who's dressed in a yukata! Speaking of firsts, Momota-kun and Orihara-san also go on their first karaoke date, and for the first time, Orihara-san goes toe-to-toe with the bigwigs at her company—and she gets some unexpected help. Tons of surprises await in the fourth volume of the super sweet and pure love story of high school boy Momota-kun and his slightly older girlfriend, Orihara-san!