Is Tsubasa to Hotaru (2016) hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2016 · 3 episodes · G - All Ages
Romance, School, Shoujo
The story revolves around Tsubasa Sonokawa, a 15-year old high school girl who fell in love with her upperclassman when he saved her after she fainted at the train station from anemia. She thought it was a meeting of fate, and visited him at his class every day. However, he told her that her feelings were "heavy," and he dumped her. She once again meets a boy after taking over her friend Yuri's job as boy's basketball team manager. She learns that she might have more of a connection with this boy named Aki than she first thought... (Source: ANN)
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