准教授・高槻彰良の推察 [Jun Kyōju Takatsuki Akira no Suisatsu] #4

Two sharp-dressed young men dominate this elegant volume 4 cover — one composed and forward-facing in a suit, the other glancing back with a more guarded intensity, surrounded by swirling supernatural flourishes of smoke, feathers, and cosmic starfield details that hint at mysteries lurking beyond the ordinary world. The subtitle そして異界の扉がひらく ("And the Door to the Other World Opens") adds an atmospheric sense of threshold and discovery perfectly echoed in the cover's moody, otherworldly palette. Published by Kadokawa's Bunko imprint, this entry in Mizukage Sawamura's series continues to blend academic intrigue with the uncanny in a package that's as visually refined as it is intriguing.