Is ReLIFE: Kanketsu-hen Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2018 · 2 episodes · PG-13 - Teens 13 or older
Slice of Life
Two specials of ReLIFE: Kanketsu-hen released on mobile and later included on Blu-ray/DVD volume.
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