I'm not entirely sure specifically as there could be various themes in it. It might be about a character's unique journey, perhaps with elements of mystery, action or personal growth. But without reading it, it's hard to say precisely.
Another option is to check with local libraries. Some libraries have sections dedicated to international literature or manga/light novel collections. They might have a copy of 'hitori no shita light novel' that you can borrow and read. If your local library doesn't have it, you could request them to acquire it.
The fifth season of the game was called "The Spirit of the Food Halberd: The Dish of Hao," adapted from the original manga of the same name drawn by Saeki Toshi. The Ova is divided into three parts, namely,"The Train of the Far Moon","The Train of the Far Moon" and "The Train of the Far Moon". The story was about the male protagonist, Yukihira Shojin, and the other chefs who had a cooking contest on the train.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
In many cases, OVA anime aren't a core part of the manga. They can offer supplementary content or alternate perspectives, but they don't typically influence the main manga storyline.
One interesting story could be about a player who discovers a hidden path in the hitori kakurenbo game. This path led them to a special area where they found rare items that helped them progress further in the game.
The 'isekai de tada hitori light novel' could potentially be about a solitary adventure in an isekai world. It might follow the journey of a character who finds themselves alone in a strange new world, perhaps facing various challenges, making new discoveries, and growing as a person while dealing with their solitude.
I don't have information about the author of this 'isekai de tada hitori light novel' at hand. You may need to search for it in specialized light novel databases or websites.