Kyoukaisenjou no Horizon: Kyokutou Naruhodo Kouza
Japanese title: 境界線上のホライゾン 極東なるほど講座
Type: ONA
Episodes: 4
Source: Light novel
Genres: Comedy, Fantasy
Studios: Sunrise
Producers: Studio Moriken
Duration: 8 min per ep
Rating: PG-13 - Teens 13 or older

Specials aired on Nico Nico Douga and YouTube, later released on BDs/DVDs.