Under the guise of "side stories" this is becoming a full Season 16.5. The term "thin book" is usually a euphemism for ero doujins but can be used for safe ones as well because the majority of them don't exceed 40 pages. Meanwhile, Fleet Journal Sequence 4 is going to exceed 220 pages as it is and the number is growing by the days. Man, Yua is FIRED UP this year.