Released January 2026, 'To Our Yesterday' is the sixth main-story arc, with Xavier and Rafayel as co-POV branches across four chapters: Transplanted World, Memory Backtraced, Drifter's Reply, and Divergence Stirs. Sub-chapter titles confirmed on the wiki include 'Familiar Stranger,' 'Another Royal,' 'Duel in Linkon,' 'Questioning at Philo,' 'Suppressor' (1-9), 'Lost Homeland' (1-10), 'String-End Warp' (1-11), 'Traces of Betrayal' (2-3), 'Holy Sword of the Goddess' (2-4), 'Backtrackers' (2-6), 'May Philos Prosper' (3-5), 'Whalefall City' (3-7), 'Faded Memories' (4-11), and 'Where Ripples Begin' (4-12). Xavier's Philos backstory, the Backtrackers' mission, and the suppressor collar shift from background lore into active foreground plot.