In Lesson XX, the captivating atmosphere follows the tale of Shizuka and Sakura, two friends in a coed boarding school. When Sakura jumps in to catch a baseball, Shizuka is struck by their friend's beauty. Amidst his confusion about Sakura's feelings, Shizuka jokes about kissing, but Sakura eagerly suggests they kiss under the stars. Despite the intense encounter, Shizuka feels they need space to sort through their emotions. This shounen ai/yaoi story weaves together misunderstandings, love, violence, and angst with a sweet resolution.