Is Battle Spirits: Burning Soul hentai?
No
Rated PG (Children) on MyAnimeList and not tagged as Hentai.

TV · 2015 · 51 episodes · PG - Children
Strategy Game
In the near future, a battle card game called "Battle Spirits" has gained enormous popularity. Players of the game—known as "Battlers"—start duelings everywhere using their color-coded cards with different attributes, creating a "Sengoku (Warring States) period" for the game. (Source: ANN)
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