Grand Blue Dreaming manga volume 21 features story by Kenji Inoue with art by Kimitake Yoshioka.

A wardrobe malfunction brought Aina's late-game love-offensive to a grinding halt. But wait… Could this be a blessing in disguise? Kohei is determined to keep up the pressure, and he'll use every dirty tactic in the book to give Aina an assist. Yet Sakurako has her own lecherous designs—and even fewer qualms!