@Xirre and anyone else who's wondering, except if there are extra in the physical books that aren't on the ebook version, don't expect actual side stories, there are a couple of location drawings and a paragraph about a certain character that's it (again on the ebook, idk if the physical tankubon has more, I'd be the first happy about it if there is).
This is my first reading ..."I think the prequel not the main story ... And the sequel meant to be the main story" whatever ...I love the characters so far ...the only thing I don't know how this cute story and somehow funny moment will end in agony at the end I can't imagine that yet (Hint's from the comments)
#now I finished reading this one going for the sequel hope everything workout there.