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.
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.
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Yes, they are relevant. The OVA (Original Video Animation) of Black Butler often contains side stories or additional content that is related to the overall world and characters of the original story. It can provide more depth to the existing characters, their relationships, and the setting of the Black Butler universe.
I think the Can't Pick Up Girl in a Dungeon OVA story could be a standalone tale or a continuation of certain storylines from the main series. It could also introduce new elements to keep fans engaged.
I'm not entirely sure as it could be a very specific or niche visual novel. It might be about a character named Levi and perhaps themes of having no regrets in a particular story or world created in the visual novel.