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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The ending of Kaguya-sama Season 2 in the manga is approximately at chapter XX. Keep in mind that there could be some minor differences in the adaptation process, but the main story beats should align.
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.
Kaguya-sama's third season ended at a point in the manga that's a bit tricky to define exactly. It roughly corresponds to a particular storyline, but for the exact chapter, you'd have to do some digging on manga-related communities or resources.
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.