RULES/HYDRA

This anthology connects characters and events from several series. In two linked stories, Ryuu is preparing to move again after arriving in Tokyo for his final year of high school, and his friend Sekai confesses feelings to him. Another story introduces Hikaru from high school, showing his relationship with Yuuji Itou and linking to later events in Hydra. A separate story explores Hikaru's reflections on his relationship with Hitomi, set between chapters of Hydra. Additional stories focus on Hikaru's role in connecting Hydra to another series, and another centers on Tooru, linking two other series while involving characters from a different story. The anthology provides connections across multiple storylines.