One work that might be similar is 'Love, Chunibyo & Other Delusions'. It also deals with characters having chuunibyou, with a focus on the relationships and the humorous situations that arise from their delusions.
The 'nee chan wa chuunibyou light novel' might be special for its unique portrayal of chuunibyou elements. It could have interesting characters with over - the - top personalities typical of chuunibyou, like believing they have special powers or are from another world. This often makes for engaging and humorous storylines.
One similar light novel could be 'The Melancholy of Haruhi Suzumiya'. It also has a main character with rather unique and self - centered traits which is somewhat similar to the chuunibyou concept. Another one might be 'Kokoro Connect' where the characters have some rather strange and interesting psychological aspects.
I'm not entirely sure as I haven't read it specifically. But generally, 'chuunibyou' often involves characters with a self - perceived 'unique' or 'quirky' mindset, usually related to fantasies. Maybe this light novel is about a sister - like character with chuunibyou traits.
I'm sorry, but without really knowing what 'hiraheishi wa kako o yumemiru manga light novel' is about, it's difficult to recommend similar works. However, if it's a story about dreams and the past, works like 'Paprika' (both the movie and the novel it was based on) might be somewhat similar in the sense that they deal with the exploration of the mind and memories through dreams.
The 'demi chan wa kataritai light novel' is centered around the concept of demi - humans. It has a light - hearted tone. In this light novel, we get to see different types of demi - humans like the dullahan, vampire, etc. It shows their struggles and joys in a world that is mostly populated by normal humans. It's really engaging as it explores their personalities and how they adapt to the human world.
Some works that might be similar are fanfics related to 'K - ON!'. They share the aspect of exploring the relationships between characters in a rather cute and comical way. Also, fanfics from 'Love, Chunibyo & Other Delusions' itself, other than the one in question, can be a great source. They usually maintain the same tone and style, with a focus on the chuunibyou elements and the development of relationships. Additionally, there are some fanfics based on 'Toradora!' that have similar relationship - centric storylines and interesting character dynamics.
Well, 'Overlord' might be a good choice too. It shares some elements like the exploration of a different world with kimi wa midara light novel. The story builds up around a powerful character in a new and strange environment, just like in kimi wa midara light novel there are unique settings and character developments.
One similar light novel could be 'My Little Sister Can't Be This Cute'. It also deals with a relationship between siblings, with a bit of a comical and heart - warming touch. Another could be 'Oreimo', which has themes related to family and the relationship between an older brother and his sister.
There are several works that share similarities. For instance, 'Re:Zero − Starting Life in Another World' has the concept of a character being in an isekai world and facing numerous challenges. The main character has to constantly adapt and find solutions, much like in 'isekai wa smartphone tomo ni web novel'. 'Grimgar of Fantasy and Ash' is also similar as it focuses on a group of characters in a new world trying to survive. And 'How a Realist Hero Rebuilt the Kingdom' where the protagonist uses his modern - day knowledge, somewhat like how the smartphone in the other work might provide useful knowledge, to make changes in the new isekai world.
One similar light novel could be 'KonoSuba'. It also has elements of isekai with a comical take on the genre. Another might be 'Re:Zero − Starting Life in Another World' which has an interesting take on the isekai concept though not exactly the same as 'isekai wa smartphone totomoni'.