Is Ichigo Mashimaro Episode 0 hentai?
English title: Strawberry Marshmallow Prologue
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2005 · 1 episodes · PG-13 - Teens 13 or older
CGDCT, Comedy
A brief special where the girls pretend to be astronauts.
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