Is Kill Me Baby: Butsuzou Kegatte Nise Halloween hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2013 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Gag Humor, School
Bundled with the franchise's Kill Me Baby Super Best Album CD (キルミーベイベー・スーパー). OAD adapted eight previously unanimated story episodes from Kazuho's original manga. (Source: ANN)
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