In preparation for the battle against the secret organization "HHH Brigade", Ikumi and the others head to the Chuo-dori shopping district to enlist the help of Koganen, the most reliable (and what Ikumi believes to be) hero. However, Yuki, who was appointed as the second generation Koganen for some reason, endured Ikumi's intense squeezing and received a special massage as a reward for winning the exam. "Promise me you won't tell anyone."